Yes, Trubbish can be shiny in Pokémon Go! Neither Trubbish nor Garbodor see any meta use in PvE or PvP, though Garbodor has some really niche uses in some PvP leagues. As meta Pokémon ...

You can defeat Poison-type Team GO Rocket Grunts to battle Shadow Trubbish and rescue it from them. You may not know whether you are facing a Poison-type Rocket Grunt or a different one ...