Search for "Mercenaries: Deadly Aliance" (a fan tribute). While not Capcom, the APK is tiny and designed specifically for touch controls.
Unlike a standard Android game, the ROM is self-contained. However, Resident Evil: The Mercenaries has a built-in “Install Data” option on 3DS that speeds up loading. On Citra, you need to install the CIA update file (version 1.1) for the best experience. Resident Evil Mercenaries Android Download Apk Data
Resident Evil: The Mercenaries is sensitive to frame drops. To optimize: Search for "Mercenaries: Deadly Aliance" (a fan tribute)
Do not look for "Mercenaries APK." Look for Citra Emulator. Unlike a standard Android game, the ROM is self-contained
Download: Search GitHub for "Citra MMJ Release" or use the official Play Store version.
If the APK + Data process for a 3DS emulator feels too unstable, Capcom actually offers several official Resident Evil experiences on Android that play very similarly to Mercenaries.