keep defeating the elite 4. you may not have a max. hp giratina like i do but eventually you'll get it there
get one pokemon to level 100
train, or rare candy
bring any level 100 Pokemon from diamond version or train a Pokemon to level 100 and go defeat them.
Like all other pokwmon games, the max level you can train a Pokemon to is 100
train in wild Pokemon battles through out the game
Have level 100 pokemon
yeah!! it is so hard to get Pokemon like that at level 100 i think that is awesome!! i have only one level 100, that is a feraligatr you have a good party let me tell you that
No,that is not actually possible.
all I can really say is that use an action replay and give it as many as it takes to get to level 100. or you can get a lvl 100 starter if you trade with someone who has or you level up your starter like crazy.
you have to use a level 100 if you want to be SURE to beat Red
battle with level 100 pokemon
There isn't someone like that in the game. But your stronger rival is Red, whose Pokemon are in level 80 or more.