Hello PHC_Mael! I'd be happy to help you with building a gaming PC setup within your budget of 20-25k. Here's a suggested build for you:
Processor: AMD Ryzen 3 3100 - around 5,500 PHP
Motherboard: MSI B450M PRO-VDH MAX - around 4,500 PHP
RAM: Kingston HyperX Fury 8GB (2x4GB) DDR4 3200MHz - around 2,500 PHP
Storage: Kingston A2000 250GB NVMe M.2 SSD - around 2,000 PHP
Graphics Card: NVIDIA GTX 1050 Ti 4GB - around 8,000 PHP
Power Supply: Seasonic S12III 550W 80+ Bronze - around 2,500 PHP
Casing: Tecware Forge M (with 3 RGB fans) - around 2,500 PHP
This build should provide you with a good entry-level gaming experience and should be able to handle most modern games at 1080p resolution with decent settings. Do note that prices may vary depending on where you purchase the components.
If you have any specific requirements or preferences, feel free to let me know so I can further tailor the build to your needs. Happy gaming!