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It is obtained by completing The Block.
It cannot be activated unless the player's shield is Prestige 3 or higher.
If the player had ever reached past zone 30 in their save, Shieldblock becomes marked among dangerous purchases.
If you're planning to do a deep run (that is, past zone 60) it is better to not obtain Shieldblock and instead get your block solely from Gyms.
Shieldblock does not scale well with prestige, and thus becomes comparatively useless as the player gets to higher levels. Each level of prestige roughly multiplies the effectiveness of all other equipments, including health shield, by 10, but only multiplies the effectiveness of blockshield by 5.