They also took part in interactive sessions with Eco Schools and Size of Wales looking at the types of action young people can take – and ways to inspire others.
Bydd gwersi yn cael eu dysgu o ganfyddiadau Plan UK o brosiectau profi a dysgu gyda sefydliadau sy'n darparu ymyriadau/gweithgareddau i fechgyn a dynion ifanc a allai helpu i leihau trais a cham-drin.