Yea, I was kind of surprised to see some over on OU feeling that Pokemon would be one of the harder franchises to create attractions out of, since I have the opposite opinion
In my mind, Pokemon would be one of the easier franchises. Between the games and anime I feel there is plenty of content to work with.
I think if there were difficulties in bringing a Pokemon Land to life it would be:
1. *Getting permission to use the IP, and once Nintendo Land turns out to be a great success that everyone is assuming will be, I don't think there will be many hurdles preventing this
*Does anyone know if the Pokemon rights were included with the deal Uni made with Nintendo?
2. Which Pokemon to include - Obviously with over 700+ Pokemon there would be no way to include them all. I think a focus on 1st gen is the best bet and then maybe include some of the most popular ones of other gens. Gen 2 is personally my favorite, but focusing on 1st gen would be best since that is the one the most people are familiar with and have a ton of nostalgia for.
3. Somewhat an extension to 1 and 2, agreeing to the same vision. For example, the latest Pokemon movie, there were rumors there was talks for one and it was finally announced the other day as being something I don't think anyone expected it to be, Detective Pikachu. I don't think this would be an issue, but you never know, could always be a wrench thrown in and one side being adamant that they want it being represented one way and the other feeling it should be represented another.
As far as creating attraction though, I don't think it would be too difficult. Need a story/plot? Well Pokemon has people, such as Team Rocket among others, who are your villains. So there are always villains who are looking to do bad and shady things that can be used to add story or spice up the ride experience. Pokemon also has diverse environments. From water environments to more arid environments. Can have a ride based on a Safari, can have another ride based on a Pokemon Lab (think of that old discovery center dark ride rumor for Jurassic Park), or a Power Plant, even a more haunted area that features ghost Pokemon (some locations like that exist in the game). Basically, whatever you can think of