hey a pokemon to look into would be a Exeggutor, or a Vileplume, BOTH have a very good set of stats, they are all very high.
Vileplume (leaf stone on gloom, gloom evolves from Oddish at level 21)
Nature: whatever you like
Petal Dance (level 44)
Sludge Bomb (TM 36)
Cut (HM01)
And whatever 4th move you want to give it, just remember, vileplume above anything is mor of a Special/Physical Wall and a Special Sweeper.
Bad moves. Cut sucks, Petal Dance sucks because you can't switch out and you'll get confused, and when suggesting movesets, give suggestions for all four slots.
Anyways, here's a much better Vileplume set:
Vileplume @Leftovers/Lum Berry
Nature: Modest
Solarbeam
Sleep Powder
Sunny Day
Moonlight
Vileplume has the trait Chlorophyll, which doubles it's speed in the sun, giving it around 400 speed. And when it's sunny, you can fire off Solarbeams in one turn and heal yourself completely with Moonlight.
OR
Vileplume @Leftovers
Nature: Careful
Leech Seed
Aromatherapy
Sleep Powder
Sludge Bomb
This is a much more defensive Vileplume whose job is to heal the team and stay alive with Leech Seed. Sludge Bomb is for enemy Grass types immune to Leech Seed.
or Exeggutor
Exeggutor (leaf stone on Exeggute)
Nature: Any
Psychic
Shadowball
Stomp
Solar Beam
the one thing if any you might want to do with an Exeggutor is make it a Physical/Special Sweeper, it has almost maxed stats in Physical attack, Special attack, and Physical Defense.
You can't max out more than two stats. There aren't enough EVs for that (and I bet you don't even know what EVs are, eh?) Anyways, Exeggutor is a terrible physical sweeper because it does not get STAB from any physical attacks.
Exeggutor @Leftovers/Lum Berry
Solarbeam
Psychic
Sunny Day
Sleep Powder/Explosion
Exeggutor also has Chlorophyll so this is it's best set. If you encounter a Pokemon you can't handle, either put it to sleep or explode on it.
oh, and another one would be the legendary bird Zapdos you catpure him at the Power Plant, at level 50, DON'T KILL HIM, SAVE BEFORE YOU BATTLE HIM, grab a **** load of Ultra Balls and a pokemon with sleep powder or hypnosis, cut its health down a bit put it to sleep, and throw a ball. buy the TM 24 (Thunderbolt) and teach it to Zapdos. and vwola, you got you Electric/Flying pokemon.
I'm sure everyone knows this, so it's not much help.