What do you think? Remember waaay back to Neo Destiny set, there's shiny Kabutops, shiny Noctowl, shiny Raichu, etc. Also in Neo Revelation, there's Shiny Gyarados, there's aren't any evolution.
So, having stronger pokemon like Shiny Charizard from Neo Destiny have advantage as being basic.
However there's a flaw, having too many energy cards on one card make take a while to use certain attacks.
Having some evolutions such as Shiny Steelix as basic card is pretty good idea, but you can only use one shiny per deck.
Also Mudkip*, Torchic*, and Treecko* can't evolve in any way.
EDIT: On second thought, it's best not to use Gyarados* Delta in the Tournament. It's attack, All-out Blast, can make you discard your deck until you have one card left in your deck.