Eevee (Furious Fists FFI 80)

Eevee – Colorless – 50 HP
Basic

Ability: Energy Evolution
When you attach a basic Energy card from your hand to this Pokémon, you may search your deck for a card that evolves from this Pokémon that is the same type as that Energy card and put it onto this Pokémon. (This counts as evolving this Pokémon.) Shuffle your deck afterward.

[C][C] Gnaw: 10 damage.

Weakness: Fighting ×2
Resistance: none
Retreat Cost: 1

Illus. sui
Furious Fists – 80/111 – Common

A rare Pokémon that adapts to harsh environments by taking on different evolutionary forms.

achildrenscardgame

This is the first card I’ve ever seen where the attack requires two Colorless Energy for only 10 damage! Not that the attack would ever be used, but it seems oddly inefficient for any Pokemon in the history of the game ever.
- MégaLAG
  
  There’s Trapinch from the same set too; looks like the design team had a roadmap where basic evolving Pokémon should do 10 for CC =P
- Fletcher Thomason
  
  There are less energy efficient attacks like this one on fearow from jungle: https://pkmncards.com/card/fearow-jungle-ju-36/ {c}{c}{c}{c} for 30 damage :P
  - Kami_sama_no_Otaku
    
    Sorry Fletcher, you’ve misread that card; Fearow (Jungle 36/64; Base Set 2 41/130; Legendary Collection 42/110) does 40 for [CCCC], not 30. It does 20 for [CCC], but that includes a coin flip to prevent all damage and effects of attacks during your opponent’s next turn.
    
    Keep looking, though, and you might find something priced worse. Back in the old days, [C] paid for 10 damage, and [X] (any non-C Energy requirement) paid for 15. Typical trends were damage being “exchanged” for an effect, going down if the effect was beneficial or up if the attack effect was detrimental. Attacks with coin flips and the like seemed built as if you were “wagering” the damage on the flips. Etc.