Making Entity go stuck beneath the ground on EntityEvent

[Heltrato]

Hello guys im trying to make an Event here that once this entity is in potionActive it will be go stuck to the ground where its standing. But i tried every methods in EntityLiving Base such as setting noClip = true , entityxCoor , entitymotionY , entitysetPosition but what it doesnt work neither. It works if its like this entity.motionY = 2D which makes them go straight up. However when i set them into -2 like that nothing happens. Any help please guys ? i need to make this work

[Heltrato]

Bump update i tried looking on Entity and yeah i hope this might work .