>>12459535Well since Yellow there has been some changes
The timeline was like this:
Red/Blue
Yellow
____
Gold/Silver
Crystal*
____
Ruby/Sapphire
Emerald*
[Firered/Leafgreen]
____
Diamond/Pearl
Platinum*
[Heartgold/Soulsilver]
____
Black/White
Black2/White2
The lines are dividing the different game generations. The games marked with [] are remakes of previous games, e.g. Firered is a remake of Red, Heartgold of Gold, etc.
The games with * are third versions, meaning they are an improved version of the previous two.
Having that in consideration I'd advise you to play:
Firered OR Leafgreen - Emerald - Heartgold OR Soulsilver - Platinum - Black OR White - Black 2 OR White 2 (if you chose black choose black 2 and same for white and white2)
You can find those games downloadable as ROMs for emulators online, although I advise buying the latest ones if you can/want.
Have fun!