O! Spring friendly! So, Cradily was supposed to be my main rain counter. VS rain, I'd have Crobat (to KO Ludicolo / Tailwind), Cradily, probably Empoleon, & somethin, but then rain teams with Toxicroak are pretty bad since Empoleon/Cradily are both weak to fighting. My last pokemon is usually Top for fake out/Intimidate/etc. for rain teams, but
Fake out, CC, Sucker Punch, Surf, Ice Beam, Energy Ball, HP Rock... none of those do much to croak.
That said, in our battle, my Hitmontop Fighting Gem CC'd your Latios for about half damage. I would imagine toxicroak would take around that much too depending on EVs. So maybe that's something to consider. So facing Toxicroak, I usually sort of "have" to bring in Landorus, but of course, Landorus will get killed in one hit vs a rain team, so, yeah, have to get the timing right. In Gasrodon's case, Toxicroak isn't a problem, but Ludicolo is.