Me again. Other ways would be Dueling, Betting, and Events. Though, Dueling and Betting require some amount of TC before starting. Both routes are a gamble however. Events are nice, especially if you're good at what the event is wanting.
|[TA]|[MLO]|Team Pokemon| Fear sucks eggs
RETRO ALSO LIKES MEN -bands
To be honest, it's depens on your talent.
If you can draw, then make Arts and sell it.
If you're good at getting profit in marketing, then do it.
If you're good at ingame you could participate in events, tourney, betting, duelling, etc.