After a trek that took you through the north, south, east, and west of Kalos, you've finally arrived at the last settlement on the map. (Aside from one post-game location. Don't worry about it.) Snowbelle City is home to the last of the Pokémon League Gyms, and will give you a good idea whether or not you're ready to take on the final challenges of Pokémon X and Y. Shall we look around?
  • Head to the Pokémon Center first. The alternate Poké Mart vendor here will sell you all of the unique Poké Mart Balls. Also in here, jammed into his usual corner, is Mr. Bonding. He'll give you the PP Restoring O-Power.
  • There are two houses to the north of the Pokémon Center. In the left house you'll find a guy who will teach a 'Mythical' move to either Keldeo (Secret Sword) or Meloetta (Relic Song), both legendary Pokémon from Generation V. You probably don't have either of them at this point. Also in here is a girl who will give you TM08 Bulk Up.
  • Follow the northern path west through Snowbelle City. Before you cross a bridge you'll find a snow drift beside a house. Check it to find a hidden Icy Rock.
  • Slide your way to the northwest of Snowbelle City, across the bridge. Here you'll find a house with a woman who will trade you a Bisharp for a Jigglypuff. 
  • Wander to the southwest to find another house. Inside is an older man who will teach one of three moves to your starter Pokémon, depending on its element. Water-types learn Hydro Cannon, Fire-types learn Blast Burn, and Grass-types learn Frenzy Plant. The starters from any generation can learn these moves so long as they're fully-evolved. Check the tree to the right of this move tutor's house to find a hidden X Sp. Atk.
  • Slide down the cliff to the left of the move tutor's house. There's a slick surface north of the house. Carefully walk south and you'll find a Full Restore. Don't skate, or you'll slide further south before you can get the item.
  • Head to the middle of town. Beside the Pokémon Gym is a clothing store. Care for a change of clothes? Check a ledge between the clothing store and the Gym to find a hidden Full Heal.

Last up is the Pokémon Gym. Hopefully you weren't itching to fight, because the Gym Leader is currently out. He's somewhere in Route 20, the Winding Woods, through the southern exit of Snowbelle City. 

Route 20: Winding Woods Pokémon
  • Amoonguss - Uncommon, Tall Grass / Flowers
  • Foongus (Horde) - Common
  • Gothorita - Rare, Tall Grass / Flowers
  • Jigglypuff - Uncommon, Tall Grass / Flowers
  • Noctowl - Common, Tall Grass / Flowers
  • Sudowoodo (Horde) - Rare
  • Trevenant - Rare, Tall Grass / Flowers
  • Trevenant (Horde) - Uncommon
  • Zoroark - Rare, Tall Grass / Flowers
The first thing you'll find on Route 20 is a field of grass with a mossy rock in the middle. If you bring an Eevee here and gain a level within the proximity of the rock the Eevee will evolve into a Leafeon. Good to know. From here Route 20 consists of a series of darkened paths that will jump you all over the Route, and you need to find the proper path to reach the next important area.

Head west from the mossy rock and you'll find a Kasib Berry tree and a Paralyze Heal. Backtrack the way you came, then head south from the mossy rock. You'll find a blank, grassy spot on the next screen. Go south one more screen from here to find a dead end and a Meadow Plate.

Backtrack to the previous area and swing west. There are trainers in the next clearing whom you can fight or skip.

Twins Nana and Nina
  • Slurpuff, level 53
  • Aromatisse, level 53
Reward: 1,696 P

The path splits to the north and south of the Twins. To the south you'll find a trainer standing by a central tree. Check the tree for an Antidote, then backtrack.

Poke Fan Roisin
  • Snubbull, level 51
  • Granbull, level 53
Reward: 4,240 P

Head north from the Twins. There's a trainer to battle in the next clearing.

Fairy Tale Girl Wynne
  • Klefki, level 52
  • Azumarill, level 52
Reward: 1,664 P

East of Wynne is a dead end. To the west is a Cuttable tree, beyond which is a trainer and a Protein. Check the tree stump in the bottom-left corner of the area for a Repeat Ball

Poke Fan Corey
  • Dedenne, level 54
Reward: 4,320 P

Backtrack after beating the trainer (or not) and go south two screens. Now the forest gets a bit tricky. Go one further screen east and check the base of the tree you find for a Mental Herb. Backtrack, then go east again. You'll appear on the opposite side of the screen you were just on. Repeat this process until you appear on the east side of an area with a blocked-off northern passage. Check the nearby dirt spot in the north for a Tiny Mushroom, then go south.

Beyond is a path leading to stairs. Go up the stairs, check the small bare spot in the grass for a Balm Mushroom, and check to your left for an X Accuracy. Beside the stairs you'll find a tree to Cut. It leads to a trainer and TM53 Energy Ball.

Hex Maniac Desdemona
  • Trevenant, level 54
Reward: 1,728 P

When you backtrack down the stairs and to the east you'll be warped around again. Go west one screen, until you find the area with the path leading north, then go south. You'll wind up in a new area called Pokémon Village.

Pokémon Village Pokémon
  • Amoonguss - Uncommon, Flowers
  • Banette - Common, Shaking Trash Cans (Thursdays only)
  • Ditto - Uncommon, Flowers
  • Foongus (Horde) - Common
  • Garbodor - Common, Shaking Trash Cans (Any day but Thursday)
  • Gothorita - Rare, Flowers
  • Jigglypuff - Uncommon, Flowers
  • Lombre - Common, Surfing
  • Lombre (Horde) - Rare
  • Noctowl - Common, Flowers
  • Poliwag (Horde) - Uncommon
  • Poliwhirl - Uncommon, Surfing
  • Zoroark - Rare, Flowers
Pokémon Village Fishing
  • Basculin - Common (Good Rod, Super Rod)
  • Poliwag - Common (Old Rod)
  • Poliwhirl - Common (Good Rod, Super Rod)
Welcome to the inner sanctum of Route 20. Wulfric, the leader of Snowbelle City Gym, is hanging out here. After a brief chat he'll head back to the gym, which means you can follow him and challenge the gym. First, though, you should have a look around.

Similar to Lost Hotel, Pokémon Village is peppered with trash cans. Occasionally you'll come across a trash can that's shaking. If you check it you'll either get into a fight with a Pokémon - Garbodor most of the time, Banette on Thursdays - or receive an item. These trash cans reset once a day.
  • Talk to a Furfrou near the entrance for a Chople Berry. The Fletchling next to it will give you a Pretty Wing.
  • In the middle of the flower beds is a sleeping Snorlax. Southwest of the Snorlax is a tire. Check it for a Pretty Wing.
  • In the southeast corner is a rise, upon which sits a Max Ether.
  • There's a Full Restore in the northwest corner of the flowers. Go through the small tent to get to it. Check the middle of the tent for a hidden Honey. (You may need to roam around a bit to find this one.)
  • Surf across the stream to the west. Hidden in the cluster of flowers on the opposite bank is a Pixie Plate.
  • To the east of the waterfall is a man in front of a cave. This is the Unknown Dungeon. Return here when you beat the Champion and you'll find, ah, a rather powerful creature within. 
That about wraps it up. Fly back to Snowbelle City and get prepped for your final gym battle.

Return Trip - Pokémon Village

At the top of the waterfall is another patch of flowers. Wade through them to the south to find TM29 Psychic.

Make a return trip to that cave you couldn't access while the Champion stood undefeated. It's no longer blocked... and a Mewtwo is waiting inside. This can be a brutal Pokémon to catch if you already used the Master Ball, as it's not only possessed of some horrible moves, it can use Recover to replenish its health. If you want to catch Mewtwo with normal Poke Balls you'll have almost no choice but to paralyze it and hope it loses a few turns.

After capturing Mewtwo you'll receive Mewtwonite X or Mewtwonite Y, depending on your version of the game. Check the stalagmite to the left of where Mewtwo was standing to find an Oval Stone before you leave.