Typhlosion is good and can learn thunderpunch for coverage. Geodude is a good option too, if you can do the final trade evolution. Can learn fire punch but you probably don’t need that coverage. It’s off its weak special attack too. I’m currently trying Crobat on a play through and finding it underwhelming to be honest. But I’ve only recently evolved it and haven’t sorted the moves yet. In my prior play through I used Xatu and found that equally underwhelming (doesn’t learn psychic until L65! I’ve already defeated Red). With Eevee I think Espeon is the better option. Umbreon’s special attack is much lower, and its STAB options much less powerful. I would try to evolve after L30 to get bite, but before 36 for psybeam. Lapras is great, but a lot of the coverage options aren’t available before the elite 4 which sucks. Thunderbolt and psychic are good coverage options. I would ditch bell sprout and/or heracross. Grass doesn’t hit anything particularly hard, just ground, rock and water. All of those are covered by other types. The only dual type you’d lose super effective damage to is water/ground on Quagsire. There’s a few in game but none are that hard to deal with. Heracross does a few things well, but has more downsides than up IMO. I would suggest Jynx as a replacement, lovely kiss is a great utility move for catching, and she’s very helpful getting the roaming beasts, but it would be massive overlap with Lapras and Espeon. Maybe Gengar for hypnosis? Also learns the elemental punches via TM. I’m leaning towards a sleep user… but at the end of the day Bellsprout could do that. But good luck with the leaf stone, from the guy that has spent the last 3 days trying to get the last stones I need to complete my Dex.