I think I've also found what they are. They're probably called spin and pokeball or spin and go and they were principally diffused in Italy and UK. While some of them (exprecially non rare pokemon) are valued around 10-15£:
Legendary pokemon are valued to a pretty high price:
Poké Ball Twister Figures Raikou, Entei, Suicune
Bandai Europe 2011
With the last fringes of the HeartGold/SoulSilver promotion in favor of Black and White, comes these gorgeous European-exlusive figure tops, complete with unique molds. Like Beyblades but cooler, these tops launch out of their Pokéballs to combat each other. These figures are also huge; to put it in perspective, the Pokéballs are 1:1 life size. Entei comes with a Timer Ball, Raikou a Quick Ball, and Suicune a Dive Ball. For the Italian language release of these figures, Bandai released them jointly with famous Italian toy company Giochi Preziosi.