Here is a set of plushes by "Play by Play", which makes plush for Spain. As you can see here, they did a set for Sonic X, released around the time of the show. They all have orange paper Sonic X tags, with the logo & some characters. Tails is also in this set, he's just not pictured here. The dolls look pretty good, they're fairly standard with decent proportions, no missing details, and an ok size. The Eggman appears to be a 'posed plush' with one hand possibly tacked to a hip. Knuckles has nice big/solid fists. The Sonic (above) has slightly inward-tilting eyes somehow, and the spikes are a little small, but he's ok too, if a bit onto the 'cutie' side (rather than his look in X). 

Owned by Pichu97