Mine is my Celebi (yes hacked) that I got in my Pokemon Sapphire at level 1 thenmigrated to my Diamond Version and traded to my Platinum version. I then got bored with Platinum so I traded it back to my Diamond and it has owned everyone we have faced ever since. Also it is legitly trained and of high stats for a Celebi.
Celebi with Focus Band (since it has alot of weaknesses)
Max Friendship
Moves:
Energy Ball
Return (because it loves me lol)
Recover (again for its many weaknesses)
Leaf storm
The only Pokemon that I ever got Shiny are the ones in my party. How I got them: Latias in Sapphire. Lucario hatched in Diamond (not Egg from Riely). Charizard hatched in Fire Red. Kyogre I got from my friend from his Emerald version. Ramparados I got from wi-fi