Can someone help me make a Butterfree deck

I can't provide a decklist as it's best you experiment, but I would consider putting the new Meganium in your deck and at the bare minimum, have Mega Venusaur ex there too. They synergize really well with Vitality Forest, and then you can put Butterfree in there too.

If you want to skip Mega Venusaur, then try some Energy Switch and Ogrepon ex?

I think you can make a fun deck out of it, but you may need at least one ex to assure your deck is fast enough to be playable. Naturally, don't forget Rare Candy too.

Good luck!

This is the best I could come up with initially. Buterfree by itself isn't strong enough to face 250-300HP EX Pokémon so ogrepon and meagnium are there too. The buterfree is good at either switching and finishing off or else shuffling something big and developed back i to their deck so they waste time.

I honestly haven't found the forest to be too useful compared to the evolution TM but at least it is a start to work from .

Also consider the 0 energy 0 retreat baby Pokémon that attacks for 10 and blocks items.

Ideally you're going to need some wider ability effect like the old vileplume or trevanant lockdown decks

+++++

Pokémon: 7
3 Caterpie JTG 1
2 Metapod JTG 2
3 Butterfree MEW 12
2 Meganium MEG 10
2 Bayleef MEG 9 PH
2 Chikorita MEG 8
3 Teal Mask Ogerpon ex TWM 25

Trainer: 14
3 Forest of Vitality MEG 117
3 Buddy-Buddy Poffin PRE 101
2 Air Balloon BLK 79
2 Arven SVI 166
2 Boss's Orders MEG 114
2 Counter Catcher PAR 160
2 Earthen Vessel PAR 163
1 Grand Tree SCR 136
4 Iono PAL 185
4 Lillie's Determination MEG 119
1 Night Stretcher SFA 61
3 Rare Candy PAF 89
1 Colress's Tenacity SFA 57
2 Technical Machine: Evolution PAR 178

Energy: 1
11 Basic {G} Energy MEE 1

Total Cards: 60