Although the shipping section is semi-isolated, the overarching principle of Bulbapedia - a neutral point of view - still applies. It is not enough to be balanced - an article must also be neutral. Therefore:
Present arguments as arguments - state what is the evidence, how the evidence is interpreted and who interprets the evidence that way. (Why should be obvious, as for when - use discretion.) State alternative interpretations if they exist. Most of all, state clearly that they are interpretations and do not judge them, instead, state the popularity of the interpretation.
Notability and decency
Although a laxer standard of notability and decency is applied in this section, it is not a licence to create articles about pairings which have been given names but have no supporters. Please use common sense.