Flying Shark, also known as Sky Shark, is a 1987 scrolling shooter arcade game developed by Toaplan and published by Taito in Japan, Romstar in North America and Electrocoin in Europe. It was later ported to several home platforms. More information on Wikipedia.

A trainer offers one or more cheats like unlimited lives, invincibility, more ammo etc. Because this is done during runtime a trainer is not to be confused with a savegame editor.