Don't think pokemon would be enough for a human to beat any of the stronger people in Gensokyo
Some of the legendaries are actually creation gods. They could at least cause an incident.
No matter the species, if anyone with malicious or violent intent were to discover the power of Pokémon for their own..."The administration of wandering souls in Gensokyo".In short, I have organized this tournament to protect Gensokyo.For any such individuals, Pokémon could serve as weapons of immense potential.What forms of friendships could blossom...Should the defenseless human masses master such potential...... in a 'military squadron' possessing great might...?... then does the established balance of power in Gensokyo risk beign jeopardized...?!Precisely.... then they could indeed jeopardize the status quo in Gensokyo and spread violence and bloodshed in their trails.At that, I arrive at the greater significance of this tournament:Gensokyo would know great peril, were Pokémon to wreak havoc in our world.