hey, figured you need help. azumarill real easy to check, honest.
mega venusaur takes its hits well, except for the occasional ice punch, and retaliates with any strong grass type move. rotom-w and jellicent are nice checks, specifically rotom-w, as it can kill it with a strong electric type attack.
there are much more but these are the few that are more powerful imo. great to know that your team is working out great too, keep up with it :D