When Ash and his friends arrived at the Grapefruit Islands, they discovered that a Snorlax was eating every grapefruit in the orchards. Eventually, the group, with help from Jigglypuff, managed to stop Snorlax and Ash as well managed to catch it.
Snorlax remained on Ash's team right up until the Orange League final, where it had to be switched with one of Ash's Tauros because it would not wake up. After Ash won the Orange League, he left Snorlax at Prof. Oak's lab on a permanent basis, as he could no longer fuel its large appetite.
In Ring Masters, Ash used Snorlax in the Sumo Conference and it ended up winning. Later on, in Better Eight Than Never, Ash used Snorlax against Clair's Kingdra and it won the battle. During the Johto League, Ash used Snorlax in his battle against his long-term rival Gary Oak. Snorlax defeated Gary's Nidoqueen and Arcanine before being defeated by Gary's Scizor. Snorlax was also used in Ash's next battle against Harrison and defeated his Steelix and Hypno, but was knocked out by Harrison's Houndoom.
Upon Ash's return from Hoenn, along with May and Max, Snorlax made fast friends with May's Munchlax, possibly because of their evolutionary relation. In Wheel of Frontier, Ash used Snorlax in his battle against Greta. Snorlax managed to defeat her Hariyama with an Ice Punch attack and her Medicham with Body Slam.
Snorlax reappeared in An Old Family Blend, where it had gone missing from its Poké Ball, like Ash's other Pokémon. Snorlax was found in the kitchen eating food. Ash tried to use it to battle Team Rocket, but it refused to wake up and accidentally tipped over Team Rocket's mechanic. Snorlax was shown defeating an unknown Trainer's Grumpig with Body Slam during the Sinnoh League.
Snorlax will reappear at the lab with all of Ash's other Pokémon in an upcoming episode of Best Wishes Season 2.
|Body Slam +||Snack Attack|
|Mega Kick||Snack Attack|
|Mega Punch||Bound For Trouble|
|Hyper Beam||Pokémon Food Fight!|
|Ice Punch||Better Eight Than Never|
|Tackle||The Right Place and the Right Mime|
|Harden||Wheel of Frontier|
|Rest||Wheel of Frontier|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- Snorlax's Poké Ball is the only one of Ash's to break.
- Snorlax is the only Pokémon Ash caught in the Orange Archipelago who he still possesses.
- In Pokémon Food Fight!, Misty says, "That is if you can ever get him to wake up", but only in the dub. Another instance of gender confirmation in the dub was in Playing with Fire!, when Professor Oak says "Snorlax's Hyper Beam was sent back to him at double the power."
- In Wheel Of Frontier, Snorlax's Harden was erroneously named Protect in the Japanese version of the anime. The error was carried on into the dub.