you use a sun stone to get bellossom or leaf stone to get velaploom on gloom, sorry if i spelled either of those rong
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Use a Sun Stone on Gloom to evolve it into Bellossom
It evolves into Gloom starting at Level 21
Personally i would say as soon as you get gloom evolve it.
Gloom evolves with the use of a Leaf/Sun Stone, not at any specific level.
Oddish evolves into Gloom at level 21. Gloom can evolve into Vileplume via Leafstone or Bellossom via Sunstone