Always stick to well-known community archives like Dedomil or PHONEKY to avoid malware.

You can find these classic .jar and .jad files on dedicated archive sites:

It sounds like you are looking for classic for older mobile phones (J2ME) with a 240x320 screen resolution. While there is no official game called "Long Paper Mario," you might be thinking of Paper Mario mods or games like Super Mario Planet that were popular on legacy sites. 📥 Popular 240x320 Mario Downloads