Just like the previous project for ADV which ended up helping PO implement the third generation, we will be collecting up as many differences between GSC and the third generation as possible to make it easier to implement on simulators. Data changes: Remove of all Pokemon, Moves, and Items not obtainable in the first two generations and evolutionary links with them. Remove Unown ! and ? Remove Abilities and Natures entirely. Add all Items removed from later games (list needed, I'll probably get this). Modify learnsets (including NYPC moves, I'll go through my sources again and get a list... but they were really badly documented so it'll be hard to be 100% accurate.). Global mechanic changes: Modify EV system (bulbapedia page). Modify Hidden Power formula to this. Hail weather condition does not exist. Double battles do not exist. Modify IV system (bulbapedia page): IVs range from 0 to 15. "Special" IV modifies both SpD and SpA stats. HP IV determined by the other four. Take the last binary digit of Attack, Defense, Speed, and Special in order to generate the 4 digit binary number for the HP IV. Gender determined by Attack IV. If the Attack IV is below a certain number specific to the species it is female, otherwise male. IV for setting the various genders and their ratios (Move your mouse to reveal the content) IV for setting the various genders and their ratios (open) IV for setting the various genders and their ratios (close) 87.5% male gender ratio Attack IV needs to be 0 or 1 to be female all others result in a male 75% female ratio Attack IV needs to be below 12 to be female 75% Male ratio Attack IV must be below 4 to be female 50-50 ratio Attack IV must be below 8 to be female Gender ratios (Move your mouse to reveal the content) Gender ratios (open) Gender ratios (close) Male - female 87.5 - 12.5 Bulbasaur Ivysaur Venusaur Charmander Charmeleon Charizard Squirtle Wartortle Blastoise Totodile Croconaw Feraligatr Chikorita Bayleef Meganium Cyndaquil Quilava Typhlosion Eevee Vaporeon Jolteon Flareon Fossils Snorlax Togepi Togetic 25 - 75 Cleffa Clefairy Clefable Vulpix Ninetales Igglybuff Jigglypuff Wigglytuff Snubbull Granbull Corsola 50 - 50 all others 75 - 25 Growlithe Arcanine Abra Kadabra Alakazam Machop Machoke Machamp Elekid Magby Electabuzz Magmar 100 - 0 Hitmontop Hitmonchan Hitmonlee Tyrogue Tauros Nidoran-M Nidorino Nidoking 0 - 100 Miltank Smoochum Jynx Kangaskhan Chansey Blissey Genderless Magnemite Magneton Staryu Starmie Voltorb Electrode Ditto Porygon Porygon2 Unown Articuno Moltres Zapdos Mewtwo Mew Raikou Suicune Entei Celebi Lugia Ho-Oh Shinyness based on IVs (if Speed, Defense, and Special IVs are 10, and the Attack IV is 2, 3, 6, 7, 10, 11, 14 or 15 the Pokemon will be Shiny). Stats are capped at 999 with the exception below. If Marowak's has Thick Club and it's Attack is boosted and the stat is boosted to over 1023 (e.g. like 255-256), it's Attack will roll back over to zero. Light Ball Pikachu with boosted SpA needs testing to see if if has the same behavior. Thief after rollover needs testing. Bad poison changes (to normal poison) when a Pokemon is not active. Specific changes (e.g. specific items functioning differently): Spikes can only stack to one layer, doing 12.5% to non-flying types. Sleep Talk will not fail if it selects Rest, and will cause the Pokemon to use Rest (though Rest will fail as usual if the Pokemon is at full HP). Counter, Mirror Coat, Roar, Vital Throw, and Whirlwind have -1 Priority. Roar and Whirlwind will fail unless they move last. Leech Seed doesn't drain HP the turn it's used. For Ghost Curse: "defeating the opponent will prevent the Pokémon it is used on taking damage from Curse on that turn." Outrage type moves do not display a message indicating that the user has become confused when they end. In Gold/Silver Belly Drum causes the user to faint if it is at 50% or less. In Crystal and Stadium 2, it will display a failure message but still raise the Pokemon's attack by two stages. In Gold/Silver when using Present the Level, Attack, and Defense variables in the damage formula are replaced by the index number of the defending Pokémon's type, 10, and the index number of the attacking Pokémon's type (secondary type is used for dual type Pokemon). Present will also only inflict a quarter of the normal damage against Rock-type and Steel-type Pokémon. In Crystal and Stadium 2 the normal mechanics are used. Details. Simple move changes (e.g. base power, accuracy): Encore lasts 2-5 turns in GSC not the 4-8 in RSE. Spite reduces the foe's PP by 1-5 rather than 2-5. Powder Snow has a 9.8% chance of freezing the target rather than 10%. If you want to support the adoption of older generations by active simulators, this is the best way you can help out! Post any differences you can think of here, and please link to sources wherever possible.