I was probably 8 years old, playing Emerald. We had a long car drive to somewhere. I don't remember where we stopped, or why we stopped there, but suffice it to say I was in a tiny DMV-esque office waiting for my parents with my little Gameboy Advanced SP. I also happened to have the cable that let you trade back in the day. So this other family came in. Another 8 year old walked in with them. Lo and behold, he's got a Gameboy Advanced too, and sits right down next to me. Also playing Pokémon. So us two random, shy 8 year olds, who had never met, and been told to never talk to strangers, immediately hit it off, and we traded Pokémon within minutes. I still have the Aggron he gave me.