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Two very noteworthy (combat-wise) grass types:


Breloom
An all-around painful little monster. It boasts a good handful of useful combat abilities:

*Incredible physical attack power
*Enhanced grass stalling tactics (Spore is a rare move)
*Poison Heal ability to enhance staying power (heals 1/8 of max HP)

If a Breloom successfully sets up, it can be incredibly painful to try and remove it. There's enough physical power to take down lots of pokemon, and thanks to its grassy trickiness it usually gets a chance to pull something off.

Breloom's glaring weaknesses are its poor defenses and poor speed.


Celebi
A tricky pokemon to acquire outside of Japan thanks to the rarity of its release, and its typing might make it seem undesirable thanks to seven total weaknesses. However, Celebi still sees a lot of usage. Its status as a legendary provides it with a couple advantages:

-An enhanced movepool
-Better-than-average stats

The type disadvantages can be overcome with the assistance of teammates. Heatran, for example, resists all seven types that Celebi is weak to (and, interestingly enough, Celebi resists the three types that are effective against Heatran.)

I have not personally seen a Celebi in action so I'm not sure what people commonly use it for. Even reading Smogon's notes on it is a bit enigmatic ; there are 14 sets to look at!

Breloom:
Poison Heal is its ability, so that means it activates at the end of each turn when Breloom is poisoned. It's like Leftovers except it heals twice as much HP. For a few additional benefits, this also means that the Poison status will do no damage to Breloom (because it heals, instead.) Acquiring this status also prevents Breloom from being affected by other status effects, so no Freeze, Sleep, Burn, or Paralyze.

Now, it might not seem like a lot, but it's enough to be a huge problem. Let's take the case I've seen it used: Jshin's Breloom.

First, Breloom has to gain control of the field using Spore. Once the opponent has been put to sleep, their torture will begin. (Note that Breloom will commonly hold a Toxic Orb so that, on this turn, he'll become poisoned.) Commonly, you either do this while a slower pokemon is in play, or when your opponent is going to switch because there's a Breloom out.

Now that the opponent is asleep, Breloom sacrifices 1/4th of his HP to put up a Substitute. The opponent usually doesn't wake up here. Sometimes the opponent switches. Either way, Breloom is able to safetly put the Substitute up. End of turn, Breloom recovers 1/8th of his HP (or 50% of the HP lost to the Substitute.)

If the opponent switched and there's no Sleep Clause in play, Breloom can simply put this pokemon to sleep using Spore. Even if the pokemon is faster, Breloom's Substitute will take the damage. Otherwise, Breloom will simply attack, often with a Focus Punch (protected by the Substitute.) Either way, he'll heal 1/8th of his max HP at the end of the turn, once again at full health.

Worst case, Breloom's Substitute is still up and he managed to take out your pokemon, thus the cycle continues. Note that the Spore + Substitute cycle can go on indefinitely ; Breloom will heal all the HP given to Substitutes by the time you've gotten a turn to attack.

The worst part of all this is that, thanks to Poison Heal healing off the damage from Substitute, Breloom can safely switch out to be used later without worrying about all the HP sacrificed. Breloom can come in and score some free kills without you being able to eliminate the threat, only for it to show up later.

Off the top of my head, there seem to be a few good ways to deal with Breloom (at least, this variety):

-Play with Sleep Clause so that he can't put more than one of your pokemon to sleep.
-Taunt (but you'll need it on a pokemon that can survive the attacks and with superior speed... Toxicroak, Gengar, and Crobat appear to be the best options.)
-Dugtrio revenge killing (but only if your dying pokemon manages to take out the Substitute before dying.) Dugtrio will be able to hold Breloom in place and finish it off with an Aerial Ace.


Celebi:
It sounds like, even though it's weak to a bunch of those, it resists them quite well. One of the Smogon sets mentioned is an Ubers scout. Basically, it's EVed in its defensive stats only and, depending on how much damage it takes, you can guess whether or not an opponent's pokemon is using a Choice item. Or something like that.

Truth be told, once I get enough Celebi to start playing around with it, I suspect I'll understand it much better then.

Not my favorite type of pokemon, but the first pokemon I ever got on the first game was a chicorita and my favorite when I was a child was bulbasaur, so they will always be a great type to me.

lol there okay^^ I like the dark types but the grass ones are cute...well most of them^^

For dealing with fire types, the 4th gen gave us a Grass + Ground with a powerful STAB Earthquake. 3nodding

Let's see...

-Immunity to electr (upgrade from resistance)
-Loses its Poison weakness (kind of a pointless gain)
-Gains a Rock resistance


The Ground STAB also allows it to hit Electr, Steel, Poison, and Rock-types (that were previously neutral to Grass, mostly Steel + Rock) in addition to the before-mentioned Fire types.

Aren't Ground-Grass combos extra-weak to Ice, a common Type in the WiFi circuit?