I know that Kyurem can fuse (with Reshiram or Zekrom). Is there another Pokémon tha can do this?
>Although several Pokémon are the result of two or more individuals combining (Dugtrio, Slowbro, Slowking, Magneton, Metang, Metagross, Weezing), White Kyurem and Black Kyurem are the only ones to be shown doing so in the core series games. They are also the only fusions that are not part of a Pokémon's evolution and are the only fusions which have been shown to be reversible.
Source: Bulbapedia/ Kyurem/ Trivia
Only Kyurem can fuse with Zekrom or Reshiram. No other Pokemon can fuse.