So... yeah, honey trees. I'll be honest, the main reason I thought of this was an excuse to push for trees with pink leaves in Pixelmon. However, I also thought of some somewhat neat features that could make the idea more fleshed-out and contribute to the idea.
How it would work is this; there would be these trees that work like normal trees, except they have one unique little feature: They can attract rare-ish or unique Pokemon.
What you do is you slather honey on the tree, and then eventually the leaves would rustle a little and whatnot. This means a Pokemon's come to the tree and is snacking on the delicious honey. You send out your Pokemon at the tree and the battle starts. Pretty much how Sinnoh's honey trees work. Fairly simple, fairly basic, but I've thought out all the details for you.
My first neat little detail is a variety of these trees. Different types of the tree would spawn in different biomes, each with different formations and different texture for the leaves and logs. Here, lemme come up with some sample ideas for the trees for you. Names are thought up on the spot, don't judge me if they're bad puns or something.
Also, if you're thinking this will be a lot of work, you could just reuse the generation code of other trees, recolor some textures, and add some cheap(and non-laggy) animations and particle effects for the rustling leaves and whatnot.
Cherry Blossom Tree
Formation: I dunno.. birch-like.
Leave Color: Pink.
Types of Pokemon: *Shrug* Cherubi Sunlight form? That kinda thing?
Biomes: Flower Forest(Very Common), Birch Forest(Common/Uncommon), Forest(Very Common/Common), etc.
Japanese Maple
Formation: I guess... slightly like Acai? Maybe a little more arching upwards and outwards, you might need to make a gen for this one yourself.
Leave Color: Red, of course.
Types of Pokemon: I feel like Heracross would easily be the type of Pokemon to show up here, along with other Pokemon that like Maple.
Biomes: Forest(Uncommon), Flower Forest(Common?), Mesa(Common?), Mushroom Island(Very Rare? Idk), Plains(Very Uncommon), River(Uncommon/Rare?), Extreme Hills(Uncommon),
White Cherry Blossom Tree
Formation: Idk, probably similar to normal cherry blossoms.
Leave Color: White
Types of Pokemon: Probably pretty much the same as the pink cherry blossoms, but different rarities. I imagine the types of Pokemon you could find in these trees would kind of seem to parallel each other.
Biomes: Flower Forest(Very Common), Birch Forest(Very Common/Common), Forest(Common/Uncommon), etc...
...It's been, like, a week and I haven't gotten back to finishing this idea. I guess I should post what I've got so far for now, and see what you guys think of it. I'll probably be posting a more fleshed out version later, but I want to get at least this posted, just in case. Besides, some feedback on what I've got so far could be useful, I'm sure some of you will have some great ideas on how to improve this! For example, maybe some of you have ideas for a neat way for the honey to work? I was thinking you'd just click the log or something and wait for a rustle, but if someone has a more creative and exciting idea, I'd be glad to hear it! :D