Board Thread:General Discussion/@comment-27124862-20160721060741/@comment-28716546-20160908195428

Swampfire: Wildvine + Heatblast

Echo Echo: Ditto with headphones

Humongosaur: Watered down Way Big.

Big Chill: Arctiguana + Ghostfreak

Jetray: Stinkfly + Ripjaws with Lazahs!

Chromastone: Literally Diamondhead.

Brainstorm: Brain Matter + Buzzshock

Goop, Alien X and Spidermonkey were original I guess.