Ok, I've beaten the game and caught Mewtwo. Is there anything else I should do, besides filling up the pokedex?
Which game red/blue/yellow or fire red/leaf green? If its red/blue/yellow hunt the three birds, if its fire red/leaf green capture the legendary gopher.
Yes. Depending on which starter you chose, one of the 3 legendary dogs will show up. Charmander= suicune, bulbasaur= entei and squirtle=raikou.
Really that's it. Besides filling the poke dex and destroying people in link battles, a sad ending