Grass knot is an excellent move against wailord because it is both super effective and wailord is pretty heavy however he is criminally light for his size and is actually less dense than air at around 770 pounds
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Theoretically yes, since Groudon weighs the most out of any Pokemon in all of the currently games, and since the move Grass Knot's damage is affected by how much the pokemon weighs, then yes.
grass knot
Route 11, it's in the top right corner opposite of the diglet cave (kanto)
here are awesome moves to teach, can beat anything with these moves: shadow ball, physcic, grass knot, confuse ray :) http://gameolosophy.com/games/gaming-on-the-go/
Treecko weighs 11 pounds and can learn many moves including energy ball, mega drain, and absorb. Treecko can also learn solar beam, and grass knot.