Care to translate?
>"wan wan~"
Rockruff is sorta the ""mascot"" for the magazine's SM sections
It's not any game info, it's just giving you Rockruff's "opinion" on the new reveals etc. etc.
コロコロ推し宿敵ポケモン
Because the manga running in the magazine features a Rockruff as the main Pokemon, so Corocoro uses it as the commentary Pokemon.
Rockruff is cute, it should be in every issue.