...XD Why does everyone misspell Doredia's JP name? It's Doredia not Doreida. Not pointing it out because of you, KG; I actually see it misspelled everywhere, even in deviantART. I don't get why, heh.
Anyways, I don't necessarily think she needs a Poison typing, more like any typing besides pure Grass. As anyone with a keen eye and fair knowledge of Grass types well knows, monotyping usually spells nonexistent type coverage. Compare the movepools of Torterra & Roserade with those of Jaroda and Doredia and you'll see what I mean.
That's why when I found out so many Grassers were pure this gen, I was severely disappointed, even more so when I realized the great potential some of these guys have with all those decent stats, but their small movepools hinder them greatly. For every move that pogeys like Jaroda and Doredia get, Torterra and Roserade get at least 2-3 more, seriously.
Anyways, Doredia's grown on me a lot, so I look forward to using her, especially because she gets Stun Spore + Teeter Dance, which is so much win you don't even know (especially competitively, there's no rule as to how many pogeys can be paralysed, and confusion usually prompts switches). I am disappointed by her abilities, though... Own Tempo saved her, but Leaf Guard and Chlorophyll? Seriously? Talk about epic fail; even Mebukijika got Serene Grace via DW, which would have been perfect for her... or even anything, really. Anything Sun-based (Chlorophyll, Leaf Guard, Solar Power) is usually not that great on a Grass type, because Fire is everywhere, and only Ludicolo and Cradily (neither of whom can/should be using Sunny Day) take neutral damage from Fire attacks.
Still, after one Butterfly Dance, Doredia is essentially Roserade, and anything that does not resist Petal Dance will be taking quite a bit of damage from her max spA (there is NO reason, EVER, to NOT have Doredia with a modest OR timid nature and/or 252 in spA and speed respectively, just like Roserade). It's too bad it cannot do anything else... literally, it cannot. Butterfly Dance and Petal Dance are its two "signature" moves, and then you can have either Stun Spore + Teeter Dance or Sleep Powder and Hidden Power, or both Sleep Powder and Stun Spore (so you can B-Dance or P-Dance stuff on the switch).
It's so outclassed by Roserade, it's not even funny. But in turn it outclasses every flowery Grass type ever; Doredia is the Grass queen of UU, there's no reason to ever use Bellossom or Sunflora over her, and in singles (but not in doubles or triples) there's no reason to use Cherrim over Doredia, either. Vileplume is still decent, though, and his higher defense paired with Effect Spore could be interesting, not to mention Toxic + Venom Shock is bound to be fun. Personally, however, I'm just gonna stick to Doredia.
...Isn't it funny how all this new weed literally makes the old weed irrelevant? No, seriously, think about it. Roserade outclasses Venusaur, Vileplume and Victreebel offensively, and Toxshroom outclasses Venusaur and Vileplume defensively (higher HP, higher defenses). And then you have Tangrowth which outclasses Meganium (and Leafeon, but he's not old weed, plus he can BP) both offensively and defensively, and now Doredia renders the existence of Bellossom and Sunflora meaningless; there's nothing those guys can do that Roserade, Tangrowth and Doredia cannot, pretty much.
Hey now, don't take offense if you like Kanto and Johto Grass types. I like them too, I'm just saying GF is basically "in with the new, out with the old" so even though I like them I have no intention of using these guys anymore; as much as I like Sunflora, Doredia does everything better, and while I like Jumpluff, it's incredibly inferior to Elfoon, and while I love Venusaur and Vileplume, I'm just gonna use Roserade instead. We have a lot of Grass and Water types, and I'm sure I'm not the only one who has noticed that if you tend to train either type regularly (I do; Grass and Water are my fave types, and I always have at least one or two in my teams), it gets repetitive and boring very, very, very quickly. XD
...Oh lol, I forgot Carnivine and Marakachi. Yeah, don't waste your time trying to use those things even if you're fond of it. They're sad trash despite their cool designs, which is one of the things I hate about GF: why make cool Pokemon that you KNOW aren't going to be used if everyone and their grandma outclasses it? Levitate and Water Absorb is hardly a good enough reason to use these two things; Doredia and Tangrowth both have worse abilities and they're still better (well actually Tangrowth now has Regeneration via DW which is epic win).