When I was trying to make my Pichu a Medalist Pokémon in the Pokéathlon in Soulsilver, its sprite was that of the Spikey-Eard Pichu in the Medalist Pokémon display case. Is this normal? Or is this some kind of glitch?
This is not a glitch this is simply because of the fact your Pichu is female (it's form is different). So no worries.
Hope I helped :D