Forgot Trash Burmy only got basic metals. :/ Well, at least the evolution CAN make use of the special Metals...
And yes, the fact that Wear Cloak only works when they're active slows the deck's recovery speed dramatically. That's why recovering can be so hard, as you'll need 1 energy from the Wear Cloak, then have to evolve to avoid getting one shotted by everything. So where's the extra 2 energy coming from? DRE? You're now not dealing as impressive damage, and 80 HP isn't too hot (though Plant's 120 HP is survivable until a Cessation Crystal equipped Kricketune raises it's hand...Blade...Thing.)
A Burmy (Plant) and Sceptile combo sounds decent, if you've got loads of Switch/Warp Point/Warp Energy in hand. But a stage 2 might be pushing the deck a bit much... Especially since we don't have DP4 yet, and thus we don't have particularly exciting pre-evolutions for Sceptile (which is where Wormadam's supposed to shine, early game. If you don't get a Burmy start, the Treeckos won't do much to help you)
And we still can't answer the fact that Empoleon sniping, Rayquaza ex d Sniping, Octillery sniping, and even Crobat (ew) sniping instantly kill the Burmies. Flygon ex D's going to KO them with 3 inbetween turns of Sand Damage and 1 Psychic Pulse, meaning you'll have to evolve them early to avoid the knock out, which means you won't be able to charge them up with Wear Cloak.