>>27401481>there doesn't really seem to be any actual themeIt's called Self-Regeneration in Jap, as in cellular regeneration. Pokemon who learn it are either psychic types since it's a psychic move/brain function, pokemon based on animals that regenerate (starfish, slugs, lizards etc), or Pokemon made of liquid (avalugg, cryogonal, jellicent). Porygon gets a pass because it can alter its pixels, and accelgor because it can weave more silk to repair itself.
Synthesis is just fine, and Venusaur hardly needs any help.
Anyway, back on topic: Growth.