First one
As with Blastoise the HP is a solid 100 here, not the best but good enough. Herbal Scent can potentially turn around the game in your favour, but since it requires a successful coint toss to work it's too risky to really rely on. Body Slam isn't a very good attack either since it requires a grand total of four energies but only deals a measly 40 damage with a chance for paralysis. Now if you've got a clever trick to return this card to your hand again and again then you've got it made because that means you can keep your grass pokes' HP up by simply having Bayleef squatting on the bench, but on its own this card isn't that good, especially with the hefty 3 in retreat cost and fire weak. 6/10 'cause the poképower is keeping it up.
Second one
Holy bananas...this thing's poképower is hands down the strongest single support for a Grass deck. With this thing on your bench the quick swarming abilities that many Grass type pokémon possess really reach their full potential, it also economizes the otherwise costly Soothing Scent attack, making it a very good deal indeed. Still, despite the 100 HP this thing is at its best on your bench, well out of harm's way. 10/10 imo, that poképower is the haxiest thing I've seen since base set Blastoise. o.o
The third one
Again, solid 100 HP, now with the extra perk of water resistance. Retreat is one cheaper than for the others, but it really isn't such a great perk since it's still two. xP The poképower is basically an empowered version of the base set Vileplume's Heal, making this card another decent bench warmer (Although it's not in the same league as the Wild Growth Meganium). The attack could use some improvement, though, as 40 damage and poisoning (While formidable enough) is rather costly at four energies. This thing is better off benchsquatting too. 7.5/10, good power but pretty weak while active.
The bottom one
Well, it's not as abbysmal as the last Blastoise, but it's not that great either. Fire weak, water resistance, and the staple 100 HP and 3 retreat, but no poképower to compensate with. .__. The attacks are okay but not awesome, and the hefty retreat is a bit of a liability. I expect a bit more from second stagers really. The unseen forces Bayleef does virtually the same in battle as this thing (only difference is that this one's Sleep Powder does 10 more damage than the Bayleef's Soothing Scent). A rather redundant card, really, don't use it if you have another Meganium available. 3/10