How do you defeat Byron in Pokemon platinum?

The best way to defeat Byron is to level up your PKMN (at least LV. 40 and up). Use fighting types here, because all of his PKMN are weak to Fighting types. If you have a Staraptor with the move "Close Combat" .. use it.

B Y R O N ' S _ P K M N

Magneton - Lv. 37 (Electric Steel)

Steelix - Lv. 38 (Ground/Steel)

Bastiodon - Lv. 41 (Rock/Steel)

- Good Luck!