Hello, I don't think its required there are way more ways to get rerolls already in-game.
Let me list some incase if you need help
1. Soleceon Quest (Every 7 day)
2. PvP Coins (150 Coins)
3. PvE Coins (250 Coins) Do able every 14 days
4. Suspicious Bot (1 every 2 week)
5. Boss at Sinnoh (Can't remeber name, But Heatran Quest completed is one of the requirements)
6. In-game Quest (obtainable only once)
Rerolls are meant for old players, Its not like just a random newbie come & do.
After in-game trade are always available. And for old players making kn-game currency is not a big deal.
Just incase, u are grinding all day try these:
1. Bcc (25k each day)
2. Excavations (I make around 2m each week when i used to do that)
3 Bossing (Add another a million to this)
& many many more.
You jst need to focus a bit more and thats enough, you just need to be punctual thats all it needs.
and, never forget celedon quest & doctor quest for easy money
Good Luck