Pokemon Red Rom Hack Changes:
1.) Impossible Evolutions now happen at level 40 instead of Trading(Kadabra into Alakazam, etc.)
2.) Holding the B button acts like Running Shoes from Gens 3 and on, so you move 2x as fast and on bike 4x as fast(no clue about while surfing yet)
3.) Updates Power, Accuracy and Type of moves to their Gen 6 equivalent(doesn't add new moves)[Bite: Dark, Gust: Flying, Etc.]
4.) Fixed some typing problems of Gen 1. Fire is strong vs Ice now, Ghost is Strong vs Psychic, Bug is Strong vs Poison?(the last one may be switched around can't remember off the top of my head)
5.) All Pokemon can learn EVERY HM
6.) Gen 2 and 6 Typings were added(Magnemite and Magneton are now Electric/Steel, Jigglypuff and Wigglytuff are now Normal/Fairy, Clefairy and Clefable are now Fairy)
7.) Gen 2 Sprites replaced the pokemon battle/pokedex sprites
8.) Gen 2 Music replaced the music
9.) Caught Pokemon Symbol added from Gen 2
10.) EXP Bar added from Gen 2
11.) Pokemon Catch Rate changed to Gen 6 style.(you don't get EXP from it though)
12.) Text Speed increased incredibly.
13.) this isn't a change but if you beat your rival infront of the near viridan city without having bought pokeballs or having caught any pokemon then talk to Prof. Oak you'll get a gen 1 easter egg.