Looking at a few Indian releases, this is probably the best "pure defense" energy layer you can buy right now. Indian releases..........sigh.
Energy Layer - Alter Chronos
Released as second booster of God Series in japan, this beyblade is starter in India, which also means it's still a booster because nobody cares about those stupid proto launchers.
The Layer has "hazardous motif" features eyes and 5 blades of God of time, Chronos as the avatar of the beyblade. For the layer itself the perimeter comprises of 5 identical blades, smooth in nature and close to inner shell of the beyblade.
These blades create good rounded perimemeter for this layer to be used in all sorts of defense based combos.
The featured gimmick of the beyblade is weight shift ring, and honestly why should anyone do that, and why would you that. It kills stamina whilw providing nothing.
The layer features medium teeths with good overall burst resistance, in god generation.
Core Disk - 6
It debuted with God Valkyrie/Genesis Valtreyak 6Vortex Reboot. 6 symmitrical wings, decent but outclassed by 4 and 7 at the time of release. No notable uses in current meta.
Disk Frame - Meteor
Same deal as the layer, 5 sides, almost balanced, decently heavy. Keep in mind this frame will cut life after death due to uneven perimeter. Perfomance Tip/Driver - Trans
Debuted with Nova Nuturn, this driver has 2 modes, stamina, which is not good for stamina, and attack, which the beyblade will go anyway due to gravity. Attack mode is usable, but the spring is slightly looser, so you can compensate that with better layers and lighter disc.