In order to catch each and every pokemon; what is the minimum

>>26419711
Pokemon X
Pokemon Y
Pokemon Omega Ruby
Pokemon Alpha Sapphire

Gen 6 literally gives you all of them for free

>>26419718
Only before Feb 2016 so you can participate in pokemon 20 year anniversary myhtical mons.

>>26419711
the action replay

On a related note, are there any pokemon that still don't have their hidden ability currently available?

Every search just gives me the list of currently released abilities, which is obviously far far larger than the list of unreleased ones. The only mons I remember for sure as being unreleased are Raikou/Suicune/Entei.

Without 20-year events? Platinum, B2/W2, X/Y, and OR/AS.

>>26419711
VS Red/Blue for Mew
Pokemon Ranger for Manaphy
Platinum
HGSS
B2W2
XY
ORAS
SuMo (If you plan to "complete" the dex through Gen 7 minus event mons)

>>26419711
Any gen VI game and a wi-fi connection. If you don't want to trade with anyone but yourself, then >>26419718

>>26419766
Pretty sure it's just those at this point, everything else is either obtainable or doesn't have a hidden ability.

>>26420462
>SuMo
End yourself.