Just straight-up curious since I almost OHKO'd Azelf in Platinum with my Weavile earlier today. Please include event mythicals/legends and roaming ones too if possible!
Experience yields were reworked starting in B/W to take a more formulaic approach that's generally derived from base stat total and evolution stage. Sw/Sh changed it again, but only for Pokemon in the final-evolution bucket (which is of course where most legends reside), so there are three lists depending on what game you're getting the experience in.
https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_effort_value_yield_(Generation_IV) https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_effort_value_yield_(Generation_VII) https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_effort_value_yield
The Exp. column is the one you're looking for; in games that follow the first list, you take that number, multiply it by the level, and divide by 7. In later games after the numbers changed, you divide by 5 instead of 7, and for all such games except XY and ORAS, do some further scaling that depends on whether you have a level advantage over them or a disadvantage.
