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Bill evolves from Billy at level 37. Billy was only obtainable from the 2015 Halloween event, along with Dopplegengar and Chompy, and (at the time of writing this) is the only Pokemon from the 2015 Halloween event that has not returned as an obtainable Pokemon for another event. During the 2015 Halloween event, Billy had a random chance of spawning at the small platform where Mew and Meloetta spawns at in the Mew Tree (at the time, normal Pokemon weren't obtained through requirements, but instead, were found around the map like a much more common Legendary, though it wouldn't be announced if they spawned). Bill is incredibly rare to see nowadays, as not only was the game not as popular before as it is now, but also, there was a massive data wipe later that year in December, which may have resulted in many losing Bill. As for Mega Bill, there was originally an exclusive mega stone for Bill which would have probably been a tournament prize, but now, you simply need the Slowbronite to mega evolve Bill. Bill is one of the only Halloween event Pokemon that can mega evolve, with the only other being Skeletoise.


  • Bill:
Level 5 50 100
Health TBD TBD 392
Attack TBD TBD 242
Defense TBD TBD 320
Speed TBD TBD 40
Special Attack TBD TBD 298
Special Defense TBD TBD 253
  • Mega Bill:
Level 5 50 100
Health TBD TBD 392
Attack TBD TBD 242
Defense TBD TBD 478
Speed TBD TBD 40
Special Attack TBD TBD 365
Special Defense TBD TBD 253


Level Move Type Category Heart Scale
1 Withdraw Water Status 1
1 Curse Ghost Status N/A
1 Yawn Normal Status N/A
1 Tackle Normal Physical 1
5 Growl Normal Status 1
9 Water Gun Water Special 1
14 Confusion Psychic Special 1
19 Disable Normal Status 1
23 Headbutt Normal Physical 1
28 Water Pulse Water Special N/A
32 Zen Headbutt Psychic Physical N/A
36 Slack Off Normal Status 1
43 Amnesia Psychic Status 1
49 Psychic Psychic Special 1
55 Rain Dance Water Status 1
62 Psych Up Normal Status N/A
68 Heal Pulse Psychic Status 1