you are probably talking about a garage compressor, in which case the output of that is around 200 psi max, your Scuba tank needs 3000 psi, that little compressor will get nowhere near that. not to mention the garage compressors put out wet, dirty air, nothing you want to be breathing or cycling through your marker. If you want to get a compressor that will fill that scuba it is going to cost you around $3000-$5000 for a used one.
A dive that requires two tanks of air to complete
You could buy your own portable diving compressor, my dive buddy has one, there not silly expensive . You must get fills from a compressor designed for diving (breathing) as the air is filtered and moisture removed.
Submarines change their depth by use of ballast tanks. To dive, they open their tanks so that they become filled with water. They also angle their dive planes. To surface, they pump the water out of their tanks and fill them with pressurised air.
you cant.
you cant
you cant
to keep the sub level or help it to dive and surface
It depends on the percentage of the mixture You can adjust the percentage depending on desired depth and length of dive.
Submarines dive by opening vent valves that allow sea water to push air out of their ballast tanks.
u cant srry
you can, but you need a dive ball
you can not, you can get a Pokemon that knows dive in battle but you cant use it outside of battle.