May caught Munchlax in Berry, Berry Interesting. As a wild Pokémon, it ended up in trouble when it was framed for stealing and eating other Trainers' Pokéblocks. However, May decided to take the responsibility for its acts, partly due to it being the only Pokémon May could find that liked her custom Pokéblocks, "May's Purple Surprise", so she decided to catch it. Although she attempted to battle it, its accidental dodging skills were too much trouble for Combusken. After it was proved innocent and became distracted by eating some falling Pokéblocks, May threw a Poké Ball at it, which was also eaten. Nevertheless, the Poké Ball was activated from inside Munchlax, and it was successfully caught.
Munchlax seemed to take a liking to Max, spending a lot of time with him. Munchlax was also the only one of May's Pokémon that was not used in her first Grand Festival. During the Festival when Skitty used Assist to show off all the moves of May's team, one of the moves it used was a Solar Beam, hinting it may have been Munchlax's to her traveling partners, which proved true.
Munchlax made its Pokémon Contest debut in Harley Rides Again, where it was used in the Contest Battles of the Wisteria Contest. Using its Solar Beam attack, it was able to knock out a Politoed, advancing May to the final round. There, it went up against Harley's Octillery. It started the battle with a Focus Punch, however, Octillery was able to avoid the attack by jumping in the air and landing on top of Munchlax's face. The Water-typePokémon then proceeded with Constrict to prevent Munchlax from using any other attacks before firing its signature move, Octazooka. When Munchlax was charging Solar Beam, Octillery used Sludge Bomb, hitting the Big Eater Pokémon and causing an explosion. After that, May called for Metronome, which resulted in Octillery being damaged by a powerful Thunder attack. However, it was able to use Rest to put itself to sleep and recover its health. Although Munchlax attacked Octillery with Tackle and Focus Punch while it was sleeping, it woke up fully restored and fired Octazooka. As Munchlax was no longer able to continue, the Contest Judges called Battle Off, resulting in a loss for May.
In Spontaneous Combusken!, Munchlax participated in the Appeals Round of the Chrysanthemum Contest. Munchlax and May made use of the enhancement Solar Beam received from the sun before taking their chances with Metronome. The result was a Rest attack, though May had come prepared with some Pink Surprise Pokéblocks, which woke Munchlax up and compelled it to show a magnificent jump. Munchlax's efforts put May through to the second round.
Munchlax continued traveling with May when she left to compete in Pokémon Contests in Johto, and stayed with her when she returned to participate the Wallace Cup in A Full Course Tag Battle!. May called it out to look for the stolen food along with Kylie's Munchlax, due to its powerful ability to sense food. Nonetheless, Munchlax was delighted to see Pikachu once again. Within a few minutes later then, it successfully located the stolen refrigerator and led the gang to it, unlike the other Munchlax. Kylie was highly impressed with how well-trained May's Munchlax is.
Munchlax was shown to be a powerful battler with equally powerful moves such as Focus Punch and Solar Beam. Munchlax enjoys performing in Pokémon Contests and is always giving full effort in a performance. Due to May's trust in luck, it would usually use Metronome to help or worsen a bad situation.
Description: Eevee would use Shadow Ball and Munchlax would use Focus Punch. The energy from the Focus Punch would fuse with the Shadow Ball and hit the opponent with the power of the Shadow Ball and the Focus Punch.
Below is a list of all cards featuring May's Munchlax.
May's Munchlax Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.