Byron's Bastiodon (Japanese: トウガントリデプス Tougan's Trideps) is Byron's main Pokémon.
Bastiodon first appeared in DP107 where Byron used it to battle against his son Roark and his Rampardos. However, the match was interrupted due to Team Rocket stealing all of Byron's fossil collection. It teamed up with Roark's Rampardos to send them blasting off and recover the fossils.
It appeared the next episode in a battle between Ash and Byron in DP108. It battled against Ash's Chimchar and won, but was eventually defeated by Ash's Gliscor