This lady is clearly in charge of a flying/normal type gym. I suggest using ice type Pokemon against her for double damage.
This guy must specialize in ground/fighting type Pokemon. He's particularly weak against psychic types.
I assume this guy is a normal type Pokemon Master. He should fall pretty easy to ghost or fighting types.
Wow, this guy is a straight-up water type Pokemon Master if I ever saw one. Just use electric type against him and he should fall pretty easy.
Mixed water/normal type Pokemon Masters are pretty rare. A mixed team of fighting and electric types should give him a run for his money.
This is clearly a family of fighting type Pokemon Masters. You may want to keep your rock type Pokemon at home for this one.
Look at what we have here. Another water type Pokemon Master. It probably doesn't need to be said, but don't try to match any of your fire types against her. Her Pokemon can do double damage against them.
A team of steel type Pokemon could pretty easily take out this Pokemon Master's normal team. You may want to mix a few fighting types in there as well, just to be safe.
I've never heard of a ground/water type Pokemon Master before. You should be able to tear through both of his Pokemon types with a grass-heavy team.
An ice or electric type team should be able to make short work of this flying type Pokemon Master. Don't bring any ground types though. Flying is invulnerable against ground.
Don't bring any ice types to your fight with this water type Pokemon Master. You'll only do half damage.
Since this is an older photo, we can only assume this Pokemon Master prefers a mix of ghost and water type Pokemon. Have a few dark types ready to go if you ever run into him, just in case.
This poison type Pokemon Master is particularly weak against ground and psychic type attacks. Watch out for his Pokemon's clear smog attack.
This man is a pretty high-level normal type Pokemon Master. A ghost heavy team should put up a really good fight against him, no matter what level he is.
This is a newer fairy type Pokemon Master. Stack your team with dragon types and you should be fine.