From Bulbapedia, the community-driven Pokémon encyclopedia.
Skull Bash (Japanese: ロケットずつき Rocket Headbutt) is a damage-dealing Normal-type move introduced in Generation I. In Generation II, it was the signature move of the Squirtle evolutionary line. It was TM40 in Generation I.
Skull Bash does nothing on the turn it is selected, other than say that the user lowered its head. On the following turn, Skull Bash will do damage, PP will be deducted from it, and it will count as the last move used. Once Skull Bash is selected, the user won’t be able to switch out until it is disrupted or fully executed.
If Skull Bash is not fully executed, PP will not be deducted from it, and it will not count as the last move used. If the opponent uses Mirror Move during the turn that the user lowers its head, Mirror Move will copy the move that the user executed immediately before using Skull Bash (or fail if it can’t).
Sleep, freeze, partial trapping, and flinching will pause but not disrupt the duration of Skull Bash.
In Stadium, Mirror Move will copy Skull Bash on either of the turns it takes to execute.
On the turn it is selected, Skull Bash will raise the user’s Defense by one level.
If a Power Herb is held by the user, Skull Bash can be executed in one turn.
Skull Bash’s power is changed from 100 to 130 and its PP changed from 15 to 10.
By leveling up
In other games
Pokémon Mystery Dungeon series
In Red Rescue Team and Blue Rescue Team and Explorers of Time and Darkness and Sky, Skull Bash is a move with 10 base power, 100% accuracy, and 15 PP. This attack hits enemy in the front; this move’s damage is doubled at the end of damage calculation. Unlike in main series, the Defense boost exists only in the charging phase. Being a two-turn move, this move cannot be linked.
Skull Bash is a Charged Attack in Pokémon GO that has been available since July 9, 2019.
Super Smash Bros. series
Pikachu uses Skull Bash as its side special from Super Smash Bros. Melee onwards. Skull Bash can be charged up to inflict more damage and knockback, as well as launching Pikachu further sideways, making it usable for recovering.
Pichu uses Skull Bash as its side special. It is similar to Pikachu’s, but can be charged longer and can deal even more damage and knockback, though hurts Pichu a little upon release. Pichu cannot legitimately learn Skull Bash in the main games, however.
In the anime
In the manga
Ash & Pikachu
The Electric Tale of Pikachu
- Green’s Blastoise, Blasty, was revealed to know Skull Bash on the official web site, but he was never shown using the move.