Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I assume you are from Germany? Central Europe is now at GMT+2 unless you are from the UK or Portugal which are GMT+1 or from Eastern Europe which is GMT+3.
Regardless, weekend works just fine. Saturday is quite tough for me so I am suggesting us to play on Friday between 6-10pm GMT+2 or on Sunday between 5-10pm GMT+2. If either time gap work, pick a specific day and a time between that range and I will be there to challenge you!