Alright here, let's see.
Leafeon Lv.X is a Stage 1 Lv.X, so it is achievable by T3.
110 HP is a little low, but if you can get an Espeon out, 130 HP is alot better.
It's Poke-Power Energy Forcing is amazing, not to mention it combos with it's attack really well, not to mention it is ANY energy card, not just basic.
Verdant Dance. GC for 30+10 for each energy attached to your pokemon, is great once you have used alot of energy acceleration or for late game.
Weakness to Fire hurts it alot, as Fire will be popular soon i am thinking. Also a Retreat Cost of 2 instead of 1 really hurts it, however both of these are negated by Umbreon
8.5/10