If you are missing keys for a game you own, the is to dump them from your own console. No emulator developer can provide them, and requesting keys in forums often leads to bans for piracy discussion.
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You cannot legally obtain keys without owning a Wii U console and dumping them yourself. Here is the method: cemu keys
Sharing or downloading keys.txt from the internet is copyright infringement in most jurisdictions, since title keys are encrypted with the Wii U common key, which is itself a copyrighted piece of console security material. Many countries' anti-circumvention laws (DMCA, EUCD) prohibit distributing or using console keys without authorization. If you are missing keys for a game
Cemu is a popular Wii U emulator for PC that allows users to play Wii U games on their computers. To use Cemu, users need to obtain specific keys that are required to decrypt and play Wii U games. Here is the method: Sharing or downloading keys
Cemu keys are digital decryption codes used by the emulator to read encrypted Wii U game data. There are two primary types of keys you need to know:
A universal key required to decrypt the Wii U's base file system. This key is the same for every Wii U console.