My ideas:
1. Interlinking between the wikis, ev. also their acoompanying websit, eg. Bulbagarden, if they have one, in addition to the NIWA site and forums, just like how the Encyclopediae Pokémonis sites do, which helps users and websites to to find it big times, or else this will get abandoned since no wikis can find it, members will stop cokming, and existing members and wikis will forget about it.
2. A subproject, which I tentatively call Project Indepence of Nintendo Wikis (PINW), which main goal is to help decent Nintendo wikia to become independent wikis, if they want to do so, and join NIWA.