Download these from their official websites (dolphin-emu.org, ppsspp.org), not random APK aggregators.
There is hope. Two emerging projects could change the landscape: Wii U Emulator Android Apk Download
A quick search for yields thousands of results, promising smooth performance and "100% working" downloads. But how much of this is real? Is true Wii U emulation on Android available today? And if so, is it safe to download those APKs? Download these from their official websites (dolphin-emu
Emulators do not come with Nintendo’s proprietary code. To run Wii U games, the emulator needs system files—specifically the dumped from a real Wii U console. Wii U Emulator Android Apk Download