>>31898838Leavanny is kinda shit, that typing is arguably the worst defensive typing a pokemon can have other then maybe ice/rock.
The rest it depends. Scoilpede is nice being fast and hitting hard but can struggle to take a hit sometimes. enough to take a hit. Heracross is simple but is reliable, hits hard and can take a hit. Galvantula is fast and a nice special attacker but seeing as how you have three good special attackers already it might struggle to find use.
Overall go heracross in my opinion.
