Chaos Realm: The coolest city in Pokemon Yellow, with me i've seen a flashing building somewhere on the field, i have fought Missingno and believe me he's not someone you want to face until you have your pokes at LVL 80-95. His ChronaMew or MewThree is insanely powerful, and his attacks vary with the power of your pokemon. If you started with Squirtle his most powerful attack will be Hydro Pump, If you started with Charmander his most powerful move will be Fireblast, you're bassically screwed if you started with bulbasaur, his move will be the Leaf element Hyper beam, a move called Berzerk Leaf, it K.O'd my LVL 81 Gyarados. It's a very scary situation, when i faced ChronaMew he had the following moves: Psychic, Mega Punch, Hyper Beam and Berzerk Leaf.
But, sadly i have not been to the chaos realm in ages, but i will try to figure out how to find the gym, then i'll post my findings.
Whew, that took a while, hope i haven't un-nerved anybody...
Get Your Game On!