Actually Airbus A380 uses only two inner engines (engine no.2 and engine no.3) with thrust reversers. Wheel brakes with these two engine thrust reversers are considered enough to slow down mighty A380.
Outer engines i.e. engine no.1 and engine no.4 are also not used with thrust reversers to avoid Foreign Object Damage (FOD).
Video showing usage of A380 engine number 2 and engine number 3 thrust reversers.