Ha Awesome.
Right here is mine
Hear it's echoes throughout the land
All of its order can adapt
It who stole it's place in the sun
It misses one less than it's root
Find it's spawn in the field or garden before Alola.
Who's that pokémon?
Is it Lucario/Mega Lucario?
Line 1: It can learn Roar, but it's also a fan-favorite, so they would be constantly talking about it.
Line 2: Mega Lucario gets Adaptability.
Line 3: It overshadows a lot of Pokémon, deservedly or otherwise.
Line 4: Unlike Riolu, it has a second typing in Steel.
Line 5&6: Two possibilities:
Possibility 1: It refers to Egg Groups, specifically, the Field and Human-like Egg Groups. Field is obvious, but Human-like would come from a "Garden of Eden" reference.
Possibility 2: It's talking of game locations, in which case, it can be found in places like Rugged Mountain (out in the field), Flocessy Ranch (a farmer's field), and both the Safari Zone and Friend Safari (zoological gardens).