Does the Power Anklet actually do anything to increase the Speed Stat of my Pokemon or is it just another useless item?

I love super fast pokemon and I use loads of Carbos to enhance the speed stat of fast pokemon such as Ninjask (even though it has the ‘Speed Boost’ ability I used it as an example of a fast pokemon) but there’s something that confuses me, the holdable itemPower Ankletstates that ‘A pokemon held item that promotes Speed gain on leveling, but reduces the Speed stat.‘now I don’t understand if this actually promotes Speed, demotes Speed or has no enhancement upon leveling on the Speed stat at all. could someone please help me understand if its a worthwhile item or not as I don’t want to level up my pokemon with it equip on my team and i’m losing potential Speed boosts. thank you.

Pleaselog inorregisterto add a comment.

VV wasn’t specific.

EVs are gained on level-up, same as Carbos boosts. That’s why the stats don’t change right away. You get more points when you level-up then you would’ve. But the Power Anklet gives you more EVs, but reduces the actual stat. So yes, if you’re maximized your Speed EVs and hold it, then it reduces your speed. But it’s only to be used to double Speed EVs, then you put in a different item.