I'm searching it too :(
Could it be this game?.. http://www.radonlabs.de/gamesprojectnomads.html I came across that while searching a game I vaguely remembered (with this question within the google hits).
You get it automatically when you begin the game, a few days after.
get the upgrade in the rocket warehouse on Five Island and then trade to another GBA game and then it will evolve. (porygon can be bought at lv. 18 at celadon game corner, and must be holding upgrade to evolve.)
If you go to store and then click upgrade island or island upgrade then there will be options on how big will the expand be. You will need a lot of neighbours!
You buy the upgrade from Gannon's shop.
you go to the island on the top right and there is a shed to upgrade and change
Yes, a flying squirrel is legal to have as a pet in Rhode Island.
The upgrades go in segments, where each segment is determined by the number of miles that the flight is. Thus, you may be able to upgrade for a few thousand filght miles if flying from New York City to Boston, but it will cost you a lot of miles to upgrade if flying from New York City to Tokyo. Check out the AA.com website for details, or call them for a specific answer.
its in the team rocket warehouse on five island
at the dragon cove in skullduggy island
You can't get a bomb bag on Bannan Island. There are two bomb bags in the game, one is inside a temple, and you have to buy an upgrade in order to hold 20 bombs (I forgot what temple, and how many Rupees it is)
you have to beat the trainers and the time in that place on seven island