[Jimera0]

@Grassblade, take a budew and name it April. April starts out as a sprouting Budew, fresh and new but fragile. As such, to prevent undue damage to your newborn friend you must switch it out of battle any time it reaches red HP. If it should ever faint as a Budew, you must immediately recover it at a Pokemon center before proceeding any further, and then not use it in the next 3 trainer battles to allow it to recuperate. But this won't do for April. April wants to grow and be stronger! As such, in order to evolve it must use Growth on 6 different routes, so it can take in the nutrients from each of the areas and get enough to grow to the next stage.

After it does that it can evolve into a Roselia, a beautiful flower. But April still feels like it has more room to grow! In an attempt to grow more, it uses Growth at the start of every battle it appears in, but to no avail. No matter how many nutrients it takes in, it just can't seem to grow any bigger. Finally though, April has a revelation once it reaches route 212 and feels rain falling on it's petals. Rain! That's what she's been missing, rain! And probably sun too, now that she thinks of it. At this point you can teach April either Sunny Day or Rain Dance. After learning either of these moves April can evolve into Roserade. April now celebrates in her chosen weather, and as such you must teach her Weather Ball (give a heart scale to the move relearner in Pastoria) as soon as possible after evolving. After this she feels like spreading her weather to the world! Have her solo any gym after evolving to Roserade, making sure to keep your weather up for the entire battle.

@Jinzha; no that seems like a nice simple, well balenced challenge. It IS a Chatot though, and as such might be a little hard just by virtue of that alone. It's certainly not brutal though, not bad for your first one.