Pokemon Go Bellsprout Community Day guide
Briefly

Shiny rates on Community Days are about 1 in 24, offering players a decent chance to catch shiny Pokémon during the three-hour window.
To efficiently hunt for shiny Bellsprout, use Incense and quickly check each Bellsprout for shinies while avoiding non-shiny ones.
Evolve Weepinbell into Victreebel during the specified time on Community Day to learn the exclusive fast move, Magical Leaf. Elite TM can also teach this move.
Victreebel is usable in raids and gyms with moves like Magical Leaf and Leaf Blade but falls behind other grass-type attackers like Roserade and Mega Beedrill in effectiveness.
Read at Polygon
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