F

9 cards have the "F" tag (27 including reprints, mirrors and so on): 7 Pokémon and 2 Trainer cards.

Breakdown

All 9 matching cards are shown. "Source" shows which part of the card the tag comes from, and "Effect" shows that text.

Card name	ID	Source	Effect
Machamp	A2b_039	Attack	If this Pokémon has at least 2 extra Fighting Energy attached, this attack does 50 more damage.
Passimian ex	A3_104	Ability	If this Pokémon is in the Active Spot and is Knocked Out by damage from an attack from your opponent's Pokémon, move all Fighting Energy from this Pokémon to 1 of your Benched Pokémon.
Donphan ex	A4_100	Attack	If this Pokémon has at least 2 extra Fighting Energy attached, this attack does 60 more damage.
Quagsire	B3_039	Attack	If this Pokémon has any Fighting Energy attached, this attack does 60 more damage.
Mega Lucario ex	B3_081	Attack	If this Pokémon has at least 1 extra Fighting Energy attached, this attack does 50 more damage.
Pupitar	C1_076	Attack	Take 2 Fighting Energy from your Energy Zone and attach it to this Pokémon.
Whiscash	C1_078	Attack	If this Pokémon has at least 3 extra Fighting Energy attached, this attack does 60 more damage.
Brock	A1_224	Effect	Take a Fighting Energy from your Energy Zone and attach it to Golem or Onix.
Rika	C1_128	Effect	Produce 2 Fighting Energy from your Energy Zone, and attach it to 1 of your Whiscash or Paldean Clodsire.