I checked the Moveset question for wailord and they say "Avalanche".I also checked it's moveset and Wailord can't learn Avalanche. Is it wrong ?
Wailord can learn Avalanche in any game with the TM in it. But not in BW + BW2.
Source: This. + Experience
Yes. Wailord can learn Avalanche from TM 72 in HG/SS, but that's the only way.
Hope this helped!
Wailord can learn Avalanche through HG/SS TM.
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