4 Runners up.

[Mr66]

Has any team been runners-up in all four grades?

[spell_check]

I've got the runners up only from 1947 onwards and the answer is no, there have been four times a team has had three runners up in one season, but not all four.

[Strawb]

Geelong 1989
Lost the preseason cup to Melbourne
the under 18 lost the grand final
reserves to fitzroy
and seniors to hawthorn

[Mr66]

Geelong 1989
Lost the preseason cup to Melbourne
the under 18 lost the grand final
reserves to fitzroy
and seniors to hawthorn

Richmond defeated North Melbourne in Under 19 GF that year.
I have not the foggiest idea which competition you are referring to Strawb.

[Strawb]

opps my bad i wasn't paying that much attention play on

[leftlegger]

Geelong lost the 1989 U19 preliminary final by less than a goal.
Because of a draw earlier in the finals series the U19 prelim was played on Grand Final Day.

Turned out a dirty day for the cats.
Losing all three games that day by a goal or less.

So strawb wasnt far off.