Building teams - are berry mons really still relevant ?

I am struggling with atrocious luck to get berry mons with at least BFS since the start of the game, and don’t get started on how many Treecos I have caught that absolutely can’t even make the minimum bar (no BFS).

I have been instead, using AAA / AAB ing mon plus dedenee and a glaceon to help me cook big meals 2-3 times a day.

Just this week, I rolled ice berry, and nicely my only decent berry mon is walrein with BFS and speed up and HB. So I used it.

Still, at the end I realise I still get better gains with cooking and changed it out into ING and pot and dedenee.

Should I just give up on berry mon and focus on InG and cooking instead?

But I may struggle with expert mode and I have not tried going there yet..

Thank you