I might run pikmin 2 but i have wii and i noticed all the wii runners have slow times. are there any differences between the wii and gcn?

actually there is one big difference between the two. you cannot perform blues early on the wii version. this is because the wii version allows you to have an extended whistle that could reach the blue pikmin before knocking down the electric gate without glitches so the blue pikmin remain npcs until the gate is destroyed by yellow pikmin. hope that helps!

Also there are several other reasons as well. Cutscenes are unskippable in Wii version, I believe. I encourage you to run, and to compare against the other Wii runners, but in my semi-expert opinion sub 2:10 would be very hard on the Wii. The lack of sequence breaks (napsacks, early blues, etc) makes the version slower, unfortunately :(

However, Sub 2:45 is very possible, there is nothing wrong with trying to be the fastest Wii runner :)