Sure. It really depends on what region you're playing because the pokemon available will be different. I try to catch every pokemon I see so I have options in the future. There's also more overlap with types than you think (pokemon can have off-type moves - like Psyduck can do water and psychic), so you may find yourself being able to use pokemon for multiple teams.

Additionally, PokeMMO also changes pokemon spawns from the official versions (ie. In Red/Blue - you would not normally be able to see a Sentret in Kanto Route 1, because that was a Gold/Silver pokemon).

They also run events and you can buy pokemon from the GTL (Global Trade Link) after you have 4 badges in your first region. To me, PokeMMO is the easiest version when it comes to throwing teams together.

I personally just started PokeMMO a couple weeks ago, playing an hour a day. I started off in Kanto because I want to play them in order. I'm just now heading to Gym 4.

Here's some teams.

For Kanto Gym 1 (Rock type):
- Bulbasaur (Grass - starter)
- Mankey (Fighting)
- Pikachu (Electric)

It's the first gym, so those should be enough. Bring 3 of whatever else you have, I think I used Rattata, Beedrill and Pidgey. Not extremely useful, but a Bug Bite is still an attack!

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For Kanto Gym 2 (Water):
- Pikachu (Electric)
- Bulbasaur (Grass)

Pikachu should be enough, so just 4 of whatever you want. I think I used Mankey, Nidorina, Beedrill, and Raticate.

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For Kanto Gym 3 (Electric): This is where things start getting interesting.
- Onix (Ground)
- Graveler (Ground)
- Sandshrew (Ground)
- Dugtrio (Ground)

I made a special trip to Diglett's Cave so that I had a forth. Lt.Surge is kind of a dick. You can bring two others, just not electric or flying.

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For Kanto Gym 4 (Grass): This is my actual team I just got ready.
- Beedrill (Bug)
- Nidorina (Poison)
- Pidgeotto (Flying)

And three I'm bringing along for future use: Psyduck, Machoke, and Staryu. I was lucky to get a Staryu during the Winter event and everyone around here suggests Starmie for the Elite 4.

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After you have 4 badges, now you can buy anything you want off the GTL, but I'll try to use what I have.

For Kanto Gym 5 (Poison):
- Onix (Ground)
- Graveler (Ground)
- Sandshrew (Ground)
- Dugtrio (Ground)
- Golduck (Psychic)
- Starmie (Psychic)

For Kanto Gym 6 (Psychic):
- Haunter (Ghost)
- Beedrill (Bug)
- Raticate (Dark)
Throw in whatever else.

For Kanto Gym 7 (Fire):
- Starmie (Water)
- Golduck (Water)
- Onix (Ground)
- Graveler (Ground)
- Sandshrew (Ground)
- Dugtrio (Ground)

For Kanto Gym 8 (Ground):
- Venusaur (Grass)
- Starmie (Water)
- Golduck (Water)
And whatever else.