Dynamax Charmander is back as a Max Battle boss in Pokémon GO and is featured as a Max Monday boss, where having a team of counters to take advantage of its multiple weaknesses makes things much more manageable. While the original Fire-type Kanto starter is anything as close to the difficulty levels of the 6-Star Gigantamax Raids, any regular Max Battle, even against base Pocket Monsters, can still take the unprepared by surprise. In this case, even if you consider yourself a pro, having an optimized team is better to have and not need it than not having it.

https://screenrant.com/pokemon-go-dynamax-charmander-max-mondays-weakness-counters/