Summary:
The third Pokémon Smash ending debuted with a live performance in
episode #64 but the song wasn't used as the actual ending until
episode #65.
Can You Say the Pokémon? BW (ポケモン言えるかな? BW 高速ver.) was still the actually ending used in
episode #64.
The song
I am a hero is by
Stereopony (ステレオポニー), a girl rock band consisting of Aimi (lead guitar/lead vocals), Nohana (bass guitar), and Shiho (drums).
The song can be found on their CD More! More!! More!!!.
Episodes: