What do you think of my team?

Hi all,
I’ve just started playing Insurgence, and I’m in Metchi Town. I think I have a solid team, but I want advice. Is the team below good? Any Pokemon (that can be found up to that point) to replace one member? Thanks!

Delta Charmeleon, Staryu, Riolu, Delta Grimer, Delta Scyther, and Tentacool.

I would suggest Ghastly, as Gengar ends up being a really powerful tank. I’d also suggest replacing Tentacool /w another pokemon, as it isn’t one of the best pokemon and has several weaknesses, considering your future gyms.