Look through

Honestly people who pick grass type starter pokemon are lunatics like you're already vulnerable to bug, flying, ice, poison and fire just by like. Default. And there's guaranteed bug and flying types in your starting routes in every game. That's fine. This is fine. The world sees your little guy as a walking salad. And if you're playing gold/silver and it's remakes then fuck you and your chikorita because the first two gyms are flying and bug type but whatever i suppose. So you manage to survive this divine sign from the universe you've made a mistake and evolved your little guy, and it's very rare for a grass type to remain only a grass type. Unfortunately, now that you've evolved as a split type it's likely that now you've either made moves that were not very effective to mildly effective.. or opened up a whole new type vulnerability. Grass ground? Now water AND grass type moves pack a decent punch. Grass poison? Sure bugs might not completely devour you, but psychic attacks are going to ruin your day. Arceus looked upon grass types and firmly reminded them they are at the bottom of the foodchain forever and ever amen. Yet people will still pick Bulbasaur. Talk about love man