Goes to the non-legendaries this time around. Absol and Flygon are made of tough stuff and they're not afraid to show it.
Flygon and Salamance did very well in their aerial duel. The pair are also very formidable when they eventually team up to fight the Pseudo-Groudon. Even though their attacks are unable to cause much damage, thanks to the Pesudo-Groudon proving to by Nigh-Invulnerable.
Diane also deserves a mention, going against her love like that, and her Heroic Sacrifice to save Butler from the Fake!Groudon later on was also pretty epic too.
Jirachi finishing off Fake Groudon with Doom Desire.