Want to invite or add friends more quickly? Go to the friends menu, and you can add people via either text message, Facebook or email. Most likely, you won’t have any friends who play the game, unless you already know them in real life. Go look around Facebook groups, this article’s comments page, and the App Store or Google Play reviews page. Most likely, there will be quite a few people who have posted their information, so that you can add them. Or you can post an “add me” post to get people to add you. For inviting friends, pick those who you know play RPGs on mobile.
If you request friends from the random request page, go to the friend request page and delete anyone who hasn’t responded in a few days. They will do nothing but screw up your friend list because you have a maximum that you have to stick to, and unanswered requests will count against the maximum. Delete them and go make friend requests for other people. And don’t make requests on level 1 guys – always pick people who are a slightly higher level than you are.
Play in the arena as often as possible to rack up glory and red crystals. Both of these can be used to purchases rare monsters. The more you increase your rank in the arena, you will earn weekly rewards of red crystal based on whatever your rank is. The higher the rank and points, the more competition you have, so fight as often as possible. Pick the easiest battles as possible.
Glory can also be earned in the arena. This is more of a “participation points” kind of thing, but if you go to the store area, you can spend glory on scrolls, devilmon, angelmon, and other goodies that you can plant in your island for extra benefits, which include stat boosts for your entire monster team, or stat boosts for specific elementals.
Try to avoid using your friend’s monsters whenever possible. When you use them, they will knock one of your monsters off your team, meaning that they won’t have the chance to gain experience points from the battle. Their best use is for boss characters and other extremely tough battles that absolutely need to be beaten right away.
Make sure you are always running the strongest arena defense team possible even if you have no intention of fighting in the arena. There are far too many other players who pay no attention to the arena, and thus they have 1-star team or even one single 1-star. These make for easy battles for you, but they also make for a lesson in what to avoid doing.