Wailmer can have one of two Abilities, both of which grant it an immunity to a Status condition: Water Veil, an Ability that makes it immune to getting a Burn from moves such as Will-O-Wisp or Flamethrower; or Oblivious, which prevents it from becoming infatuated with an opposing Pokémon.
Wailmer gain the opportunity to evolve into Wailord starting at Level 40.
Wailmer takes on the apperance of a blue whale, shaped like an oversized ball with fins.
Wailmer doesn't have any differences to differentiate between male and female.
Wailmer can be found at Routes 223 & 230 in Diamond, Pearl and Platinum. The only way to obtain a Wailmer in Heart Gold and Soul Silver would be to transfer one from the Pokéwalker, as Wailmer appear on the Warm Beach course.
Wailmer can be found by Surfing onto a Water-based Shaking Spot at Undella Town and Undella Bay in Black and White. In Black 2 and White 2, Wailmer appear at Undella Bay while Surfing at Shaking Spots.
Wailmer appears at Secret Storage 14, Endless Level 8, Forever Level 8 and Mr. Who's Den in Pokémon Trozei!.
Wailmer appears at Silver Trench and Far-Off Sea in the first round of Mystery Dungeon games on floors 41-50 each. Wailmer appears at Surrounded Sea B1-B18, Miracle Sea B1-B18 & DPB1-DPB4, and Bottomless Sea B1-B49 in Explorers of Time, Explorers of Darkness & Explorers of Sky. Wailmer is exclusive to Stormy Adventure Squad in Mystery Dungeon 3, appearing on the first 13 floors of Stormy Seas.
Wailmer appears at Saffra Sea during the Sea Capture Challenge in the first Pokémon Ranger game. Wailmer also appears Sea of Wailord in Pokémon Ranger: Shadows of Almia, but the Poké Assist Slash Lv3 is required to reach it. Wailmer does not appear in Pokémon Ranger: Guardian Signs.
Wailmer can be found at Desolated Ruins Beach 3-1 in Pokémon Rumble Blast.
Trading Card Game
Wailmer appears in a total of seven sets and the 5th Movie Halfdeck. It appears as a Common Card in the EX Sandstorm and EX Legend Maker sets. Wailmer appears as an Uncommon Card in the EX Ruby and Sapphire, Great Encounters, Supreme Victors, Triumphant and Dragons Exalted sets.
Another trainer used a Wailmer in the episode The Great Eight Fate. Most recently, a Wild Wailmer was found to be stuck in a sewer in the episode Leading A Stray, leading to an eventual rescue of the trapped Pokémon.
A trainer named Ross used a Wailmer in the film Pokémon Heroes: Latios & Latias. Wild Wailmer appeared in the Pikachu Short Pikachu's Pikaboo, along with the films Pokémon Ranger and the Temple of the Sea and Giratina and the Sky Warrior.
Wailmer's Manga info is unknown at this time.
Wailmer is listed in the NFE, or Not Fully Evolved Tier of Competitive Battling as it is an unevolved Pokémon.
Via Dream World
Via Move Tutor (Black 2/White 2)
Generation III Exclusive Move Tutor Moves
Generation IV Exclusive Moves
Via Move Tutor (Heart Gold/Soul Silver)
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