while it may work a little slow, you should try out stuff like Laturn Prime or Blatoise PL; they hit for quite some damage with a decent amount of energy in play, just Like Electivire FB himself(Laturn Prime has even the exact same attack, only does Lanturn's version 10 more damage). You could smack up the Active with Laturn/Blastoise/Electivire FB, or snipe around with Garchomp C.
If you don't want to be too reliant on Electivire's power I suggest you add in either Floatzel UL or Feraligatr prime, or even the odd breed of anything that can attach energies fast. I made a post for another thread about this as well, here's a list of what can be used to retrieve energy from the discard:
- Jirachi (UL/CoL): up to 3 P energy; attach to self; come into play power; requires coin flip(s)
- Steelix Prime: up to 1 energy, any type; attach to self; attack (2/CC energy, 30 damage)
- Regirock (La): 1 F energy, attach to self; power that requires 2 discard
- Electivire FB Lv X: up to 3 energy of any kind; attach anywhere; power which ends your turn with no attack possible
- Ninetails (UL): up to 3 R energy; attach to 1 of your pokémon in play; attack (1/R energy, no damage)
- Yanmega (SV): up to 1 G energy; attach to self; power which requires to be active
- Rayquaza C Lv X: up to 1 energy, any type; attach to self, body which requires to be active, take damage, and not going KO
- Delcatty (Pl): up to 2 basic energy; place on top of your deck (any order); power which puts 2 damage counters on Delcatty (90 hp)
- Dialga (Pl #5): up to 3 basic energy (in combination with pokémon cards, excluding Lv X); place on top of your deck (any order); come into play power
- Dialga (Pl #23): up to 1 basic energy; attach to self; requires coin flip; attack (2/CC energy, 20 damage)
- Magnezone (Sf #6): up to 1 L or M energy; attach to active; puts 1 damage counter on your active pokémon
- Heatran Lv X: up to 2 basic energy; attach to a R or M pokémon that used energy discard to attack this turn; happens at end of the turn
- Regigigas Lv X: up to 2 basic energy; attach to self; power requires to Knock Out one of your other pokémon; also heals user 80 damage
- Kingdra (La): any amount of W energy in the discard; returns to the deck, attack (0 energy/free, 10x damage times amount of W energy returned to the deck)
- Mewtwo (Md): up to 2 energy, any type; attach to self; attack (0 energy/free, no damage)
- Hippowdon (Md): up to 1 F energy; attach to self; attack (0 energy/free, 20 damage)
- Garchomp Lv X (Md): up to 3 basic energy; attach to attack target; attack (0 energy/free, no damage); attack requires a pokémon i nthe discard to be returned to an empty bench space, and attaches up to 3 energy to the new benched pokémon.
Hope this helps!