OH! I GET IT! The thing is, when Tails make the Wisps translator, it says that Yakker come from a far away soda, where they water their flowers with dances. Just like Cosmo said. So in the final panel, Sonic and Tails grab the translator and they are freak out because they found out that is true. And it took me a long time to get it.
"Okay, he says his name is 'Talks-a-lot' and he's from a far away soda and where flowers water them with dances." The joke comes from Sonic Colours where Sonic meets Yacker and tries to find out what's happening to the Wisps but the translator Tails made doesn't work too well. Am I the only one who got the joke as soon as I read this? It made me lol. Hard.