From Bulbapedia, the community-driven Pokémon encyclopedia.
Team Rocket's blast off – Running gag of Pokémon anime, when Team Rocket trio loses the fight and being sent into the sky by the Pokémon's attack, usually Ash's Pikachu's Thunderbolt.
Blast off as a term first appeared in Ash Catches a Pokémon and the first "usual" blast off appeared in Clefairy and the Moon Stone. In some episode trio could blast off several times
In Sun & Moon series the blasting off gag was replaced with Bewear's rescues, though usual blast offs happening in some episodes, being sometimes interrupted by Bewear.