830K accounts from Pokémon Negro (pokemonnegro.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswords
In approximately October 2016, the Spanish Pokémon site Pokémon Negro suffered a data breach. The attack resulted in the disclosure of 830k accounts including email and IP addresses along with plain text passwords. Pokémon Negro did not respond when contacted about the breach.
Source: Have I Been Pwned (CC BY 4.0)