in the last gym battle.the one that was locked opens when you have 7 badges.
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You can battle Giovanni but you can only battle Giovanni with the event Celebi that was distributed at Gamestop retail stores for a limited time which is no longer available.
The serious last time you beat Giovanni is at the viridian city Pokemon gym.
Neutrino was not an official pokemon at the time of Pokemon Yellow. There is still no official pokemon species named "neutrino".
You can battle Wally a second time after defeating the Pokemon League.
Yes it can. Using the Time Capsule in Gold and Silver it's possible to trade between Red, Blue, and Yellow.