All of my monsters are getting injured all of the sudden what caused this. I mean my joker who is 200+ in every stat got injured by a plant in a competition so we had to forfeit and lost what is happening?

Was it tired before the battle? Also, be aware that 200 is very low, and a more powerful monster (it IS possible to have stats up to 999) can easily hurt it, especially if that monster has harder-hitting attacks than yours does.

Take a look at the thread showing the tournament opponents and their stats. You want to be as good or better than these monsters, especially if you haven't gotten any hard-hitting attacks yet.

It was not tired and it only was in a rank E tourney and my joker has almost every attack becuse he is adventure level 15 oh and the plant's highest stat was life at 185

Plants have much better guts regen than Jokers do. To be guaranteed of winning an event you need to be a couple levels higher than your opponent on speed, acc, and pow/int. Any monster if hit enough can be injured in battle. Being tired, or stressed adds to the likelyhood of damage. The bets way to avoid this is to get higher speed, so you dodge attacks and don't get hit.