Originally Posted by wikipedia

According to Malachy, Pope John Paul II will be succeded by one more pope, and then by Peter the Roman. However, there is much debate about this. The last Pope, Peter the Roman, was added to the list in 1820, and does not appear in the original list. If this is the case, then Malachy intended the next Pope to be the last. On the other hand, others argue that Malachy did not indicate that The next Pope and Peter the Roman will be consecutive, and there may be more popes he did not foresee.

One line of reasoning indicates the motto of the next pope, 'The Glory of the Olive' is a pointer that the next Pope will be Christ himself, and that Peter the Roman is fictitious. Israel is referred to in Malchy's texts as 'The Olive' and so 'The Glory of the Olive' would be Christ himself, and so herald the Last Judgement.