>>56376160I love how interconnected gen 3 is, moreso than practically any other generation. You've got the Hoenn games, which can trade with the Kanto games, both can trade with the Orre games, they can trade with Pokemon Box Ruby & Sapphire if you had it, there's wireless link minigames for trainer card completion, they can interface with the e-Reader for berry cards, the Eon Ticket, and NPC battle cards, you can team up for the Battle Tower, you can have your team progress through Mt. Battle in Orre to see how well they stack up, etc.
I liked it so much that I spent a small fortune acquiring all the games I missed so I could go about connecting them, and completed a dex of all 386 Pokemon in Emerald using them all.