After reaching Tier-5, I looked through my improved status and new skills. I felt more than satisfied with them. Now there is almost no one who can challenge me and win the battle unless they have some weird skills.
There are people who has skills that can block other people's skills or even reduce attribute values for a while.
Of course that can be countered as long your skill levels and attribute values are very high. There is also a constraint known as Rank.
As long as your Tier is two ranks above the opponent's, there is a high probability of the opponent's skills ending in failure. This is not a guarantee. There are various factors that decides the outcome of a battle.
The first one obviously is strength. As long as your rank is high, you are the one to win the battle but that's not always the case.