Yes, Pokémon can forget TM moves. The Move Deleters can delete TM moves and during Pokémon's level ups, in the event of attempting to know a new move, you can overwrite any of the four existing moves as long as it isn't a HM move.
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uhh teach it a differant move over it(yeah its fun to learn HA HA) You can also go to pastoria city and then go into a house in one house there is a man who makes your Pokemon forget moves
go to your TM pocket,choose a TM,choose a Pokemon that has able under its name,then if it has 4 moves delete one.
in blackthorn city there is a house full of people that can teach moves to pokemon, make pokemon forget moves etc;
You cant find it. Pokemon learns the moves when you level it
yes,let the Pokemon you want to lean a move and teach it