"It is said that once every ten years, a child is born in Viridian Forest, possessing mysterious powers"--Pokespe (Sourced from Bulbapedia but I have no clue what arc this is from).

I recall the powers skipped over Silver, Yellow is 11 when the arc starts (but 8 during RGB), Giovanni is another one but he's in his 40s (according to another wiki, unless he's 30, which I don't buy.) , which means Lance must be somewhere in the 18-20 range and... yeah, there's no way I would've ever been able to figure that out with Mato's art style (I thought he was a teenager... in hindsight, this makes the yellow lance fight even funnier because this grown man gets blown up by a child). This just means there's some 30 year old person out in the Pokespe world who inexplicably has Viridian Forest powers and missed out on that world ending debacle.

I guess there could be other potential magic forests in the Pokemon world but that's clearly not a thing pokespe will probably ever touch again because it was a case of "we need something to fill the gap of time between G/S since it got delayed during spaceworld so we're just gonna... make something up for the yellow plot."

So possible candidates are Ilex in Johto (because Celebi), and Winding Woods in Kalos (because having it next to Pokemon Village and Snowbelle City seems more interesting than Santalune which is a map copy of viridian, plus Xerneas as the guardian of life).

I don't think Eterna forest is one solely because of the haunted mansion blocking out whatever potential magic there could be. I doubt the swords of justice would allow a person like that to exist in Unova because of their distrust of humans (N is not a part of the powers thing because he only has a base level understanding nor does he have the healing or mind reading powers and also I don't think he's 30 years old).

Moonlight Musings

Thinking on WIPs

Musings on Forests (Pokespe)