In the Hoenn region, Shroomish, a rare Mushroom-type Pokémon, can be found living in the wild. Sure, !
When shiny, Shroomish and its evolution, Breloom, both display a radiant hue of vibrant orange and sunshine yellow. Breloom is a viable option for use in certain PvP leagues, while also serving as a formidable Fighting-type attacker in PvE scenarios. Not unhealthy, mushroom with fingers. Not unhealthy.
According to a previous study conducted by The Silph Highway, which has since ceased operations, but made its findings accessible through the Wayback Machine, the average probability of encountering a shiny Pokémon is approximately 1 in 500, as observed on a typical day. Shroomish is not yet officially confirmed as a permanent “permaboost” species, meaning it’s only an uncommon spawn with potential for boosted shiny prices.
Not a lot, sadly. The likelihood of this occurrence appears to be purely chance-driven. Shiny Pokémon catch rates are determined by developer Niantic and typically experience significant boosts during special events like Community Days or Safari Zones, as well as in Legendary Raids. Consuming no objects boosts shiny Pokémon catches.